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How do I know which /dev/ttyS* is my serial port?

- by ShaChris23

I have a laptop which has only one serial port. I went into: /dev directory, and I found: ttyS0 ttyS1 ttyS2 ttyS3 How do I know which of those "ttyS" refers to my serial port?

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Load images in parallel - supported by browser or a feature to implement?

- by Michael Mao

Hi all: I am not a pro in web development and Apache server still remains a mystery to me. we've got a project which runs on LAMP, pretty much like all the commercial hosting plans. I am confused about one problem : does modern browsers support image loading in parallel? or this requires some special feature/config set up from server side? Can this be done with PHP coding or by some server-side configuration? Is a special content delivery networking needed for this? The benchmark demonstration will be the flickr website. I am too suprised to see how all image thumbnails are loaded in a short time after a search as if there were only one image to load. Sorry I cannot present any code to you... completed lost in this:(

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Using Lan Management port - which kind of switch for remote control?

- by zephyrus

Hello everyone, I have no expertize in server hardware, however i have some IBM X3550 7978 and HP DL 160/G6 servers with 2 Lan ports, and a management port (that seem to be another Lan port). Have anyone tried to use the management to control remotely the low level functions of the servers (reboots for example) ? Which kind of switch or other devices have you used for this? thank you Massimiliano

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Monitor number of bytes transferred to/from IP address on port.

- by Mike

Can anyone recommend a linux command line tool to monitor the number of bytes transferred between the local server and a specified IP address/port. The equivalent tcpdump command would be: tcpdump -s 0 -i any -w mycapture.trc port 80 host google.com which outputs : 46 packets captured 131 packets received by filter 0 packets dropped by kernel I'd like something similar that outputs: 54 bytes out, 176 bytes in I'd like it to work on RHEL and be free/open-source. It would be good if there was an existing tool which I was just missing too!

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Is there a way to detect which port on an ethernet switch a device is connected to?

- by banno

Since the wall jack is typically always connected to the same port on the switch I would like to be able to know which device is connected at a specific location. In my case I am talking about printers. I have code to go out on the network and find the IP Address of all of my printers, but would like to be able to update a server based on a printer being swapped out of a location for maintenance or repair. Is there a method for determining a port connection?

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Python cannot go over internet network

- by user1642826

I am currently trying to work with python networking and I have reached a bit of a road block. I am not able to network with any computer but localhost, which is kind-of useless with what networking is concerned. I have tried on my local network, from one computer to another, and I have tried over the internet, both fail. The only time I can make it work is if (when running on the server's computer) it's ip is set as 'localhost' or '192.168.2.129' (computers ip). I have spent hours going over opening ports with my isp and have gotten nowhere, so I decided to try this forum. I have my windows firewall down and I have included some pictures of important screen shots. I have no idea what the problem is and this has spanned almost a year of calls to my isp. The computer, modem, and router have all been replaced in that time. Screen shots: import socket import threading import socketserver class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler): def handle(self): data = self.request.recv(1024) cur_thread = threading.current_thread() response = "{}: {}".format(cur_thread.name, data) self.request.sendall(b'worked') class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer): pass def client(ip, port, message): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((ip, port)) try: sock.sendall(message) response = sock.recv(1024) print("Received: {}".format(response)) finally: sock.close() if __name__ == "__main__": # Port 0 means to select an arbitrary unused port HOST, PORT = "192.168.2.129", 9000 server = ThreadedTCPServer((HOST, PORT), ThreadedTCPRequestHandler) ip, port = server.server_address # Start a thread with the server -- that thread will then start one # more thread for each request server_thread = threading.Thread(target=server.serve_forever) # Exit the server thread when the main thread terminates server_thread.daemon = True server_thread.start() print("Server loop running in thread:", server_thread.name) ip = '12.34.56.789' print(ip, port) client(ip, port, b'Hello World 1') client(ip, port, b'Hello World 2') client(ip, port, b'Hello World 3') server.shutdown() I do not know where the error is occurring. I get this error: Traceback (most recent call last): File "C:\Users\Dr.Frev\Desktop\serverTest.py", line 43, in <module> client(ip, port, b'Hello World 1') File "C:\Users\Dr.Frev\Desktop\serverTest.py", line 18, in client sock.connect((ip, port)) socket.error: [Errno 10061] No connection could be made because the target machine actively refused it Any help will be greatly appreciated. *if this isn't a proper forum for this, could someone direct me to a more appropriate one.

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How copy with shell commands(Linux) from 1 computer have (permanent url + open port) to 2 computer (secure way)?

- by BenBen

How copy with shell commands(Linux) from remote(my office computer) computer (permanent url + open port) to my (home) computer home/remote_computer_user/Desktop/test1.txt to my home computer home/home_computer_user/Downloads/ ? What I am doing: 1. ssh <user>@<computer1address> -p <port> :: success to get remote computer shell () 2. (I think I should use scp , but I dont how exactly in my case) Please if you can, write the exact commands that i should to from the shell Thanks in advance

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Not able to connect to port 80 using telnet?

- by pranitkothari

When I try to connect my Windows PC with telnet, its giving me following error. Welcome to Microsoft Telnet Client Escape Character is 'CTRL+]' Microsoft Telnet open 192.168.220.135 80 Connecting To 192.168.220.135...Could not open connection to the host, on port 8 0: Connect failed Microsoft Telnet I have firewall off for both the machines. Can you please suggest how to connect to port 80 using telnet. Thanks.

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Parallelism in .NET – Part 3, Imperative Data Parallelism: Early Termination

- by Reed

Although simple data parallelism allows us to easily parallelize many of our iteration statements, there are cases that it does not handle well. In my previous discussion, I focused on data parallelism with no shared state, and where every element is being processed exactly the same. Unfortunately, there are many common cases where this does not happen. If we are dealing with a loop that requires early termination, extra care is required when parallelizing. Often, while processing in a loop, once a certain condition is met, it is no longer necessary to continue processing. This may be a matter of finding a specific element within the collection, or reaching some error case. The important distinction here is that, it is often impossible to know until runtime, what set of elements needs to be processed. In my initial discussion of data parallelism, I mentioned that this technique is a candidate when you can decompose the problem based on the data involved, and you wish to apply a single operation concurrently on all of the elements of a collection. This covers many of the potential cases, but sometimes, after processing some of the elements, we need to stop processing. As an example, lets go back to our previous Parallel.ForEach example with contacting a customer. However, this time, we’ll change the requirements slightly. In this case, we’ll add an extra condition – if the store is unable to email the customer, we will exit gracefully. The thinking here, of course, is that if the store is currently unable to email, the next time this operation runs, it will handle the same situation, so we can just skip our processing entirely. The original, serial case, with this extra condition, might look something like the following: foreach(var customer in customers) { // Run some process that takes some time... DateTime lastContact = theStore.GetLastContact(customer); TimeSpan timeSinceContact = DateTime.Now - lastContact; // If it's been more than two weeks, send an email, and update... if (timeSinceContact.Days > 14) { // Exit gracefully if we fail to email, since this // entire process can be repeated later without issue. if (theStore.EmailCustomer(customer) == false) break; customer.LastEmailContact = DateTime.Now; } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Here, we’re processing our loop, but at any point, if we fail to send our email successfully, we just abandon this process, and assume that it will get handled correctly the next time our routine is run. If we try to parallelize this using Parallel.ForEach, as we did previously, we’ll run into an error almost immediately: the break statement we’re using is only valid when enclosed within an iteration statement, such as foreach. When we switch to Parallel.ForEach, we’re no longer within an iteration statement – we’re a delegate running in a method. This needs to be handled slightly differently when parallelized. Instead of using the break statement, we need to utilize a new class in the Task Parallel Library: ParallelLoopState. The ParallelLoopState class is intended to allow concurrently running loop bodies a way to interact with each other, and provides us with a way to break out of a loop. In order to use this, we will use a different overload of Parallel.ForEach which takes an IEnumerable<T> and an Action<T, ParallelLoopState> instead of an Action<T>. Using this, we can parallelize the above operation by doing: Parallel.ForEach(customers, (customer, parallelLoopState) => { // Run some process that takes some time... DateTime lastContact = theStore.GetLastContact(customer); TimeSpan timeSinceContact = DateTime.Now - lastContact; // If it's been more than two weeks, send an email, and update... if (timeSinceContact.Days > 14) { // Exit gracefully if we fail to email, since this // entire process can be repeated later without issue. if (theStore.EmailCustomer(customer) == false) parallelLoopState.Break(); else customer.LastEmailContact = DateTime.Now; } }); There are a couple of important points here. First, we didn’t actually instantiate the ParallelLoopState instance. It was provided directly to us via the Parallel class. All we needed to do was change our lambda expression to reflect that we want to use the loop state, and the Parallel class creates an instance for our use. We also needed to change our logic slightly when we call Break(). Since Break() doesn’t stop the program flow within our block, we needed to add an else case to only set the property in customer when we succeeded. This same technique can be used to break out of a Parallel.For loop. That being said, there is a huge difference between using ParallelLoopState to cause early termination and to use break in a standard iteration statement. When dealing with a loop serially, break will immediately terminate the processing within the closest enclosing loop statement. Calling ParallelLoopState.Break(), however, has a very different behavior. The issue is that, now, we’re no longer processing one element at a time. If we break in one of our threads, there are other threads that will likely still be executing. This leads to an important observation about termination of parallel code: Early termination in parallel routines is not immediate. Code will continue to run after you request a termination. This may seem problematic at first, but it is something you just need to keep in mind while designing your routine. ParallelLoopState.Break() should be thought of as a request. We are telling the runtime that no elements that were in the collection past the element we’re currently processing need to be processed, and leaving it up to the runtime to decide how to handle this as gracefully as possible. Although this may seem problematic at first, it is a good thing. If the runtime tried to immediately stop processing, many of our elements would be partially processed. It would be like putting a return statement in a random location throughout our loop body – which could have horrific consequences to our code’s maintainability. In order to understand and effectively write parallel routines, we, as developers, need a subtle, but profound shift in our thinking. We can no longer think in terms of sequential processes, but rather need to think in terms of requests to the system that may be handled differently than we’d first expect. This is more natural to developers who have dealt with asynchronous models previously, but is an important distinction when moving to concurrent programming models. As an example, I’ll discuss the Break() method. ParallelLoopState.Break() functions in a way that may be unexpected at first. When you call Break() from a loop body, the runtime will continue to process all elements of the collection that were found prior to the element that was being processed when the Break() method was called. This is done to keep the behavior of the Break() method as close to the behavior of the break statement as possible. We can see the behavior in this simple code: var collection = Enumerable.Range(0, 20); var pResult = Parallel.ForEach(collection, (element, state) => { if (element > 10) { Console.WriteLine("Breaking on {0}", element); state.Break(); } Console.WriteLine(element); }); If we run this, we get a result that may seem unexpected at first: 0 2 1 5 6 3 4 10 Breaking on 11 11 Breaking on 12 12 9 Breaking on 13 13 7 8 Breaking on 15 15 What is occurring here is that we loop until we find the first element where the element is greater than 10. In this case, this was found, the first time, when one of our threads reached element 11. It requested that the loop stop by calling Break() at this point. However, the loop continued processing until all of the elements less than 11 were completed, then terminated. This means that it will guarantee that elements 9, 7, and 8 are completed before it stops processing. You can see our other threads that were running each tried to break as well, but since Break() was called on the element with a value of 11, it decides which elements (0-10) must be processed. If this behavior is not desirable, there is another option. Instead of calling ParallelLoopState.Break(), you can call ParallelLoopState.Stop(). The Stop() method requests that the runtime terminate as soon as possible , without guaranteeing that any other elements are processed. Stop() will not stop the processing within an element, so elements already being processed will continue to be processed. It will prevent new elements, even ones found earlier in the collection, from being processed. Also, when Stop() is called, the ParallelLoopState’s IsStopped property will return true. This lets longer running processes poll for this value, and return after performing any necessary cleanup. The basic rule of thumb for choosing between Break() and Stop() is the following. Use ParallelLoopState.Stop() when possible, since it terminates more quickly. This is particularly useful in situations where you are searching for an element or a condition in the collection. Once you’ve found it, you do not need to do any other processing, so Stop() is more appropriate. Use ParallelLoopState.Break() if you need to more closely match the behavior of the C# break statement. Both methods behave differently than our C# break statement. Unfortunately, when parallelizing a routine, more thought and care needs to be put into every aspect of your routine than you may otherwise expect. This is due to my second observation: Parallelizing a routine will almost always change its behavior. This sounds crazy at first, but it’s a concept that’s so simple its easy to forget. We’re purposely telling the system to process more than one thing at the same time, which means that the sequence in which things get processed is no longer deterministic. It is easy to change the behavior of your routine in very subtle ways by introducing parallelism. Often, the changes are not avoidable, even if they don’t have any adverse side effects. This leads to my final observation for this post: Parallelization is something that should be handled with care and forethought, added by design, and not just introduced casually.

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ant ftp doesn't download files in subdirectories

- by Kristof Neirynck

Hello, I'm trying to download files in subdirectories from an ftp server with ant. The exact set of files is known. Some of them are in subdirectories. Ant only seems to download the ones in the root directory. It does work if I download all files without listing them. The first ftp action should do the exact same thing as the second. Instead it complains about "Hidden files" and seems to prefix the paths with "\\". Does anyone know what's wrong here? Is this a bug in commons-net? build.xml <?xml version="1.0" encoding="utf-8"?> <project name="example" default="example" basedir="."> <taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP" /> <target name="example">  <ftp action="get" verbose="true" server="localhost" userid="example" password="example"> <fileset dir="downloads" casesensitive="false" includes="root1.txt,root2.txt,a/a.txt,a/b/ab.txt,c/c.txt" /> </ftp>  <ftp action="get" verbose="true" server="localhost" userid="example" password="example"> <fileset dir="downloads" casesensitive="false" includes="**/*" /> </ftp> </target> </project> run_ant.bat @ECHO OFF PUSHD %~dp0 SET CLASSPATH= SET ANT_HOME=C:\apache-ant-1.8.0 SET ant=%ANT_HOME%\bin\ant.bat SET antoptions=-nouserlib -noclasspath -d SET ftpjars=^ -lib lib\jakarta-oro-2.0.8.jar ^ -lib lib\commons-net-2.0.jar CALL %ant% %antoptions% %ftpjars% > output.txt POPD output.txt Unable to locate tools.jar. Expected to find it in C:\PROGRA~1\Java\jre6\lib\tools.jar Apache Ant version 1.8.0 compiled on February 1 2010 Trying the default build file: build.xml Buildfile: G:\ftp\build.xml Adding reference: ant.PropertyHelper Detected Java version: 1.6 in: C:\PROGRA~1\Java\jre6 Detected OS: Windows 7 Adding reference: ant.ComponentHelper Setting ro project property: ant.file -> G:\ftp\build.xml Setting ro project property: ant.file.type -> file Adding reference: ant.projectHelper Adding reference: ant.parsing.context Adding reference: ant.targets parsing buildfile G:\ftp\build.xml with URI = file:/G:/ftp/build.xml Setting ro project property: ant.project.name -> example Adding reference: example Setting ro project property: ant.project.default-target -> example Setting ro project property: ant.file.example -> G:\ftp\build.xml Setting ro project property: ant.file.type.example -> file Project base dir set to: G:\ftp +Target: +Target: example Adding reference: ant.LocalProperties parsing buildfile jar:file:/C:/apache-ant-1.8.0/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/C:/apache-ant-1.8.0/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file Class org.apache.tools.ant.taskdefs.optional.net.FTP loaded from parent loader (parentFirst) Setting ro project property: ant.project.invoked-targets -> example Attempting to create object of type org.apache.tools.ant.helper.DefaultExecutor Adding reference: ant.executor Build sequence for target(s) `example' is [example] Complete build sequence is [example, ] example: [ftp] Opening FTP connection to localhost [ftp] connected [ftp] logging in to FTP server [ftp] login succeeded [ftp] getting files fileset: Setup scanner in dir G:\ftp\downloads with patternSet{ includes: [root1.txt, root2.txt, a/a.txt, a/b/ab.txt] excludes: [] } will try to cd to A where a directory called a exists testing case sensitivity, attempting to cd to A remote system is case sensitive : false [ftp] Hidden file \\a\b\ assumed to not be a symlink. filelist map used in listing files filelist map used in listing files [ftp] Hidden file \\a\b\ assumed to not be a symlink. filelist map used in listing files filelist map used in listing files filelist map used in listing files filelist map used in listing files filelist map used in listing files [ftp] Hidden file \\a\a.txt assumed to not be a symlink. filelist map used in listing files [ftp] Hidden file \\a\a.txt assumed to not be a symlink. filelist map used in listing files filelist map used in listing files filelist map used in listing files [ftp] transferring root1.txt to G:\ftp\downloads\root1.txt [ftp] File G:\ftp\downloads\root1.txt copied from localhost [ftp] transferring root2.txt to G:\ftp\downloads\root2.txt [ftp] File G:\ftp\downloads\root2.txt copied from localhost [ftp] 2 files retrieved [ftp] disconnecting [ftp] Opening FTP connection to localhost [ftp] connected [ftp] logging in to FTP server [ftp] login succeeded [ftp] getting files fileset: Setup scanner in dir G:\ftp\downloads with patternSet{ includes: [**/*] excludes: [] } will try to cd to A where a directory called a exists testing case sensitivity, attempting to cd to A remote system is case sensitive : false [ftp] transferring a\a.txt to G:\ftp\downloads\a\a.txt [ftp] File G:\ftp\downloads\a\a.txt copied from localhost [ftp] transferring a\b\ab.txt to G:\ftp\downloads\a\b\ab.txt [ftp] File G:\ftp\downloads\a\b\ab.txt copied from localhost [ftp] transferring c\c.txt to G:\ftp\downloads\c\c.txt [ftp] File G:\ftp\downloads\c\c.txt copied from localhost [ftp] transferring root1.txt to G:\ftp\downloads\root1.txt [ftp] File G:\ftp\downloads\root1.txt copied from localhost [ftp] transferring root2.txt to G:\ftp\downloads\root2.txt [ftp] File G:\ftp\downloads\root2.txt copied from localhost [ftp] 5 files retrieved [ftp] disconnecting BUILD SUCCESSFUL Total time: 0 seconds server log (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> Connected, sending welcome message... (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected]) (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/ (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> USER example (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 331 Password required for example (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> PASS ******* (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 230 Logged on (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> TYPE I (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Type set to I (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> SYST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 215 UNIX emulated by FileZilla (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,232 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD A (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/A" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD b (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //a/b (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,233 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,234 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //\\a\b\ (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //\\a\b\ (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,235 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,236 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> RETR root1.txt (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,237 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> RETR root2.txt (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> QUIT (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 221 Goodbye (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> disconnected. (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> Connected, sending welcome message... (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected]) (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/ (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> USER example (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 331 Password required for example (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> PASS ******* (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 230 Logged on (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> TYPE I (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Type set to I (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> SYST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 215 UNIX emulated by FileZilla (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,239 (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD A (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/A" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,240 (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD a (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,241 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD //a/ (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD b (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,242 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD c (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/c" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,243 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,244 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR a/a.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,245 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR a/b/ab.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,246 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR c/c.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,247 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR root1.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,248 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR root2.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> QUIT (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 221 Goodbye (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> disconnected.

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HP SmartArray P400: How to repair failed logical drive?

- by TegtmeierDE

I have a HP Server with SmartArray P400 controller (incl. 256 MB Cache/Battery Backup) with a logicaldrive with replaced failed physicaldrive that does not rebuild. This is how it looked when I detected the error: ~# /usr/sbin/hpacucli ctrl slot=0 show config Smart Array P400 in Slot 0 (Embedded) (sn: XXXX) array A (SATA, Unused Space: 0 MB) logicaldrive 1 (698.6 GB, RAID 1, OK) physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SATA, 750 GB, OK) physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SATA, 750 GB, OK) array B (SATA, Unused Space: 0 MB) logicaldrive 2 (2.7 TB, RAID 5, Failed) physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SATA, 750 GB, OK) physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SATA, 750 GB, OK) physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SATA, 750 GB, OK) physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SATA, 750 GB, Failed) physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SATA, 750 GB, OK) unassigned physicaldrive 2I:1:8 (port 2I:box 1:bay 8, SATA, 750 GB, OK) ~# I thought that I had drive 2I:1:8 configured as a spare for Array A and Array B, but it seems this was not the case :-(. I noticed the problem due to I/O errors on the host, even if only 1 physicaldrive of the RAID5 is failed. Does someone know why this could happen? The logicaldrive should go into "Degraded" mode but still be fully accessible from the host os!? I first tried to add the unassigned drive 2I:1:8 as a spare to logicaldrive 2, but this was not possible: ~# /usr/sbin/hpacucli ctrl slot=0 array B add spares=2I:1:8 Error: This operation is not supported with the current configuration. Use the "show" command on devices to show additional details about the configuration. ~# Interestingly it is possible to add the unassigned drive to the first array without problems. I thought maybe the controller put the array into "failed" state due to the missing spare and protects failed arrays from modification. So I tried was to reenable the logicaldrive (to add the spare afterwards): ~# /usr/sbin/hpacucli ctrl slot=0 ld 2 modify reenable Warning: Any previously existing data on the logical drive may not be valid or recoverable. Continue? (y/n) y Error: This operation is not supported with the current configuration. Use the "show" command on devices to show additional details about the configuration. ~# But as you can see, re-enabling the logicaldrive this was not possible. Now I replaced the failed drive by hotswapping it with the unassigned drive. The status now looks like this: ~# /usr/sbin/hpacucli ctrl slot=0 show config Smart Array P400 in Slot 0 (Embedded) (sn: XXXX) array A (SATA, Unused Space: 0 MB) logicaldrive 1 (698.6 GB, RAID 1, OK) physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SATA, 750 GB, OK) physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SATA, 750 GB, OK) array B (SATA, Unused Space: 0 MB) logicaldrive 2 (2.7 TB, RAID 5, Failed) physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SATA, 750 GB, OK) physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SATA, 750 GB, OK) physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SATA, 750 GB, OK) physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SATA, 750 GB, OK) physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SATA, 750 GB, OK) ~# The logical drive is still not accessible. Why is it not rebuilding? What can I do? FYI, this is the configuration of my controller: ~# /usr/sbin/hpacucli ctrl slot=0 show Smart Array P400 in Slot 0 (Embedded) Bus Interface: PCI Slot: 0 Serial Number: XXXX Cache Serial Number: XXXX RAID 6 (ADG) Status: Enabled Controller Status: OK Chassis Slot: Hardware Revision: Rev E Firmware Version: 5.22 Rebuild Priority: Medium Expand Priority: Medium Surface Scan Delay: 15 secs Surface Analysis Inconsistency Notification: Disabled Raid1 Write Buffering: Disabled Post Prompt Timeout: 0 secs Cache Board Present: True Cache Status: OK Accelerator Ratio: 25% Read / 75% Write Drive Write Cache: Disabled Total Cache Size: 256 MB No-Battery Write Cache: Disabled Cache Backup Power Source: Batteries Battery/Capacitor Count: 1 Battery/Capacitor Status: OK SATA NCQ Supported: True ~# Thanks for you help in advance.

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Friday Tips #6, Part 1

- by Chris Kawalek

We have a two parter this week, with this post focusing on desktop virtualization and the next one on server virtualization. Question: Why would I use the Oracle Secure Global Desktop Secure Gateway? Answer by Rick Butland, Principal Sales Consultant, Oracle Desktop Virtualization: Well, for the benefit of those who might not be familiar with client connections in Oracle Secure Global Desktop (SGD), let me back up and briefly explain. An SGD client connects to an SGD server using two distinct protocols, which, by default, require two distinct TCP ports. The first is the HTTP protocol, used by the web browser to connect to the SGD webserver on TCP port 80, or if secure connections are enabled (SSL/TLS), then TCP port 443, commonly identified as the "HTTPS" port, that is, "SSL encrypted HTTP." The second protocol from the client to the server is the Adaptive Internet Protocol, or AIP, which is used for displaying applications, transferring drive mapping data, print jobs, and so on. By default, AIP uses the TCP port 3104, or port 5307 when SSL is enabled. When SGD clients need to access SGD over a firewall, the ports that AIP requires are typically "closed"; and most administrators are reluctant, to put it mildly, to change their firewall configurations to allow AIP traffic on 3144/5307. To avoid this problem, SGD introduced "Firewall Forwarding", a technique where, in effect, both http and AIP traffic are "multiplexed" onto a single "well-known" TCP port, that is port 443, the https port. This is also known as single-port firewall traversal. This technique takes advantage of the fact that, as a "well-known service", port 443 is usually "open", allowing (encrypted) traffic to pass. At the target SGD server, the two protocols are de-multiplexed and routed appropriately. The Secure Gateway was developed in response to requirements from customers for SGD to support multi-stage DMZ's, and to avoid exposing SGD servers and the information they contain directly to connections from the Internet. The Secure Gateway acts as a reverse-proxy in the first-tier of the DMZ, accepting, authenticating, and terminating incoming client connections, and then re-encrypting the connections, and proxying them, routing them on to SGD servers, deeper in the network. The client no longer needs to know the name/IP address of the SGD servers in their network, they connect to the gateway, only. The gateway takes care of those internal network details. The Secure Gateway supports the same "single-port firewall" capability as does "Firewall Forwarding", but offers the additional advantage of load-balancing incoming client connections amongst SGD array members, which could be cumbersome without a forward-deployed secure gateway. Load-balancing weights and policies can be monitored and tuned using the "Balancer Manager" application, and Apache mod_proxy_balancer directives. Going forward, our architects recommend the use of the Secure Gateway over "Firewall Forwarding" for single-port firewall traversal, due to its architectural advantages, its greater flexibility and enhanced features. Finally, it should be noted that the Secure Gateway is not separately priced; any licensed SGD customer may use the Secure Gateway component at no additional cost. For more information, see the "Secure Gateway Administrator's Guide".

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ovs-vsctl: "eth0" is not a valid UUID

- by Przemek Lach

I'm trying to setup an open v-switch inside my Ubuntu 12.04 Server VM. I have created three interfaces for this VM and I want to create a port mirror inside of the VM using these there interfaces and open v-switch. There are three Host-Only Adapters: eth0, eth1, eth2. The idea is that three other VM's will be connected to these adapters. One of these VM's will stream UDP video to eth0 and I want the vswitch'd VM to mirror those packets from eth0 onto eth1 and eth2. Each of the VM's connected to eth1 and eth2 will get the same video stream. I performed the following steps to install open v-switch: $ apt-get install python-simplejson python-qt4 python-twisted-conch automake autoconf gcc uml-utilities libtool build-essential $ apt-get install build-essential autoconf automake pkg-config $ wget http://openvswitch.org/releases/openvswitch-1.7.1.tar.gz $ tar xf http://openvswitch.org/releases/openvswitch-1.7.1.tar.gz $ cd http://openvswitch.org/releases/openvswitch-1.7.1.tar.gz $ apt-get install libssl-dev iproute tcpdump linux-headers-`uname -r` $ ./boot.sh $ ./configure - -with-linux=/lib/modules/`uname -r`/build $ make $ sudo make install After installation I configured as follows: $ insmod datapath/linux/openvswitch.ko $ sudo touch /usr/local/etc/ovs-vswitchd.conf $ mkdir -p /usr/local/etc/openvswitch $ ovsdb-tool create /usr/local/etc/openvswitch/conf.db Then I started the server: $ ovsdb-server /usr/local/etc/openvswitch/conf.db \ --remote=punix:/usr/local/var/run/openvswitch/db.sock \ --remote=db:Open_vSwitch,manager_options \ --private-key=db:SSL,private_key \ --certificate=db:SSL,certificate \ --bootstrap-ca-cert=db:SSL,ca_cert --pidfile --detach --log-file $ ovs-vsctl –no-wait init (run only once) $ ovs-vswitchd --pidfile --detach The above steps I got from this tutorial and it all worked fine. I then proceeded to add a port mirror based on the open v-switch documentation under Port Mirroring. I successfully completed the following commands: $ ovs-vsctl add-br br0 $ ovs-vsctl add-port br0 eth0 $ ovs-vsctl add-port br0 eth1 $ ovs-vsctl add-port br0 eth2 $ ifconfig eth0 promisc up $ ifconfig eth1 promisc up $ ifconfig eth2 promisc up At this point when I run ovs-vsctl show I get the following: 75bda8c2-b870-438b-9115-e36288ea1cd8 Bridge "br0" Port "br0" Interface "br0" type: internal Port "eth0" Interface "eth0" Port "eth2" Interface "eth2" Port "eth1" Interface "eth1" And when I run ifconfig I get the following: eth0 Link encap:Ethernet HWaddr 08:00:27:9f:51:ca inet6 addr: fe80::a00:27ff:fe9f:51ca/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:17 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1494 (1.4 KB) TX bytes:468 (468.0 B) eth1 Link encap:Ethernet HWaddr 08:00:27:53:02:d4 inet6 addr: fe80::a00:27ff:fe53:2d4/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:17 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1494 (1.4 KB) TX bytes:468 (468.0 B) eth2 Link encap:Ethernet HWaddr 08:00:27:cb:a5:93 inet6 addr: fe80::a00:27ff:fecb:a593/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:17 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1494 (1.4 KB) TX bytes:468 (468.0 B) eth3 Link encap:Ethernet HWaddr 08:00:27:df:bb:d8 inet addr:192.168.1.139 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fedf:bbd8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2211 errors:0 dropped:0 overruns:0 frame:0 TX packets:1196 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:182987 (182.9 KB) TX bytes:125441 (125.4 KB) NOTE: I use eth3 as a bridge adapter for SSH'ing into the VM. So now, I think I've done everything correctly but when I try to create the bridge using the following command: $ ovs-vsctl -- set Bridge br0 mirrors=@m -- --id=@eth0 get Port eth0 -- --id=@eth1 get Port eth1 -- --id=@m create Mirror name=app1Mirror select-dst-port=eth0 select-src-port=@eth0 output-port=@eth1,eth2 I get the following error: ovs-vsctl: "eth0" is not a valid UUID I don't understand why it's not able to find the interfaces?

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Ubuntu 9.10 and Squid 2.7 Transparent Proxy TCP_DENIED

- by user298814

Hi, We've spent the last two days trying to get squid 2.7 to work with ubuntu 9.10. The computer running ubuntu has two network interfaces: eth0 and eth1 with dhcp running on eth1. Both interfaces have static ip's, eth0 is connected to the Internet and eth1 is connected to our LAN. We have followed literally dozens of different tutorials with no success. The tutorial here was the last one we did that actually got us some sort of results: http://www.basicconfig.com/linuxnetwork/setup_ubuntu_squid_proxy_server_beginner_guide. When we try to access a site like seriouswheels.com from the LAN we get the following message on the client machine: ERROR The requested URL could not be retrieved Invalid Request error was encountered while trying to process the request: GET / HTTP/1.1 Host: www.seriouswheels.com Connection: keep-alive User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/532.9 (KHTML, like Gecko) Chrome/5.0.307.11 Safari/532.9 Cache-Control: max-age=0 Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,/;q=0.5 Accept-Encoding: gzip,deflate,sdch Cookie: __utmz=88947353.1269218405.1.1.utmccn=(direct)|utmcsr=(direct)|utmcmd=(none); __qca=P0-1052556952-1269218405250; __utma=88947353.1027590811.1269218405.1269218405.1269218405.1; __qseg=Q_D Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 Some possible problems are: Missing or unknown request method. Missing URL. Missing HTTP Identifier (HTTP/1.0). Request is too large. Content-Length missing for POST or PUT requests. Illegal character in hostname; underscores are not allowed. Your cache administrator is webmaster. Below are all the configuration files: /etc/squid/squid.conf, /etc/network/if-up.d/00-firewall, /etc/network/interfaces, /var/log/squid/access.log. Something somewhere is wrong but we cannot figure out where. Our end goal for all of this is the superimpose content onto every page that a client requests on the LAN. We've been told that squid is the way to do this but at this point in the game we are just trying to get squid setup correctly as our proxy. Thanks in advance. squid.conf acl all src all acl manager proto cache_object acl localhost src 127.0.0.1/32 acl to_localhost dst 127.0.0.0/8 acl localnet src 192.168.0.0/24 acl SSL_ports port 443 # https acl SSL_ports port 563 # snews acl SSL_ports port 873 # rsync acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access allow localnet http_access deny all icp_access allow localnet icp_access deny all http_port 3128 hierarchy_stoplist cgi-bin ? cache_dir ufs /var/spool/squid/cache1 1000 16 256 access_log /var/log/squid/access.log squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern (Release|Package(.gz)*)$ 0 20% 2880 refresh_pattern . 0 20% 4320 acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9] upgrade_http0.9 deny shoutcast acl apache rep_header Server ^Apache broken_vary_encoding allow apache extension_methods REPORT MERGE MKACTIVITY CHECKOUT cache_mgr webmaster cache_effective_user proxy cache_effective_group proxy hosts_file /etc/hosts coredump_dir /var/spool/squid access.log 1269243042.740 0 192.168.1.11 TCP_DENIED/400 2576 GET NONE:// - NONE/- text/html 00-firewall iptables -F iptables -t nat -F iptables -t mangle -F iptables -X echo 1 | tee /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -j MASQUERADE iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128 networking auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 142.104.109.179 netmask 255.255.224.0 gateway 142.104.127.254 auto eth1 iface eth1 inet static address 192.168.1.100 netmask 255.255.255.0

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What needs to be done to port a Windows Flash game to Android?

- by Russell Yan

My team has developed a game using Flash (with Lua embeded) that targets Windows. And we want to port that game to Android (also iOS in the future). It's acceptable to rewrite the Flash part of client. And some other team in our company recommended Unity3D to replace the Flash part. Since we have no experience in Android/iOS development, we would need to learn some new tool/language anyway. So we would like that learning still be useful after the porting and when we starting a new game. Any thoughts? Edits: I think it is worth noticing the background of the game : the project is started by a tester and developer, both without knowing much about flex and actionscript. They built the game while learning, so most of the code is hard to maintain. I and other two developers joined the project after a year or so when one has leave (and the other be our manager). The other two developers are just graduates with little experience and little knowledge of flex. I am good at the server part and the c# language. Based on the fact that the code is hard to maintain (and we do need to change a lot of code to make the game easier to playe in a mobile device), and I am good at c# (and learning). I still tend to do the porting with Unity, which could get better performance and possibly save time.

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How to control messages to the same port from different emitters?

- by Alex In Paris

Scene: A company has many factories X, each emits a message to the same receive port in a Biztalk server Y; if all messages are processed without much delay, each will trigger an outgoing message to another system Z. Problem: Sometimes a factory loses its connection for a half-day or more and, when the connection is reestablished, thousands of messages get emitted. Now, the messages still get processed well by Y (Biztalk can easily handle the load) but system Z can't handle the flood and may lock up and severely delay the processing of all other messages from the other X. What is the solution? Creating multiple receive locations that permits us to pause one X or another would lose us information if the factory isn't smart enough to know whether the message was received or not. What is the basic pattern to apply in Biztalk for this problem? Would some throttling parameters help to limit the flow from any one X? Or are their techniques on the end part of Y which I should use instead ? I would prefer this last one since I can be confident that the message box will remember any failures, which could then be resumed.

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How do I get a Mac to request a new IP address from another DHCP server running in parallel while Ne

- by huyqt

Hello, I have an interesting situation. I'm trying to us a Linux based machine to allow Mac's to Netboot (similiar to PXE boot) by running a DHCP service in parallel with the "global" DHCP server. The local DHCP server hands out IPs in a private subnet, e.g., 10.168.0.10-10.168.254-254, while the "global" DHCP server hands out IPs from the IP range 10.0.0.1 - 10.0.1.254. The local DHCP range is only supposed to be used in Preboot Execution Environment and Netboot. The local DHCP server is something I have control over, but I do not have access to the global DHCP server. I have a filter to only allow members with the vendor strings "AAPLBSDPC/i386" and "PXEClient". PXE works fine, but Netboot has a quirk. The Apple systems that haven't been connected to the network yet can Netboot fine. But once it grabs a "real" IP address from the global DHCP server, it will "save" it and request it the next time we want it to netboot (which the local dhcp server won't give it). This is what I want: Mar 30 10:52:28 dev01 dhcpd: DHCPDISCOVER from 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:29 dev01 dhcpd: DHCPOFFER on 10.168.222.46 to 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:31 dev01 dhcpd: DHCPREQUEST for 10.168.222.46 (10.168.0.1) from 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:31 dev01 dhcpd: DHCPACK on 10.168.222.46 to 34:15:xx:xx:xx:xx via eth1 Mar 30 10:52:32 dev01 in.tftpd[5890]: tftp: client does not accept options Mar 30 10:52:53 dev01 in.tftpd[5891]: tftp: client does not accept options Mar 30 10:52:53 dev01 in.tftpd[5893]: tftp: client does not accept options Mar 30 10:52:54 dev01 in.tftpd[5895]: tftp: client does not accept options This is what I get when it already has a "stored" IP: Mar 30 10:51:29 dev01 dhcpd: DHCPDISCOVER from 00:25:xx:xx:xx:xx via eth1 Mar 30 10:51:30 dev01 dhcpd: DHCPOFFER on 10.168.222.45 to 00:25:xx:xx:xx:xx via eth1 Mar 30 10:51:31 dev01 dhcpd: DHCPREQUEST for 10.0.0.61 (10.0.0.1) from 00:25:xx:xx:xx:xx via eth1: ignored (not authoritative). Do you have any suggestions? It would be much appreciated.

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Unable to logon to vpn

- by nitin pande

My openvpn client log file- The interesting bit: Tue Oct 26 12:32:49 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:32:49 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:32:49 2010 TCP/UDP: Closing socket The rest of the log just in case: Tue Oct 26 12:32:35 2010 OpenVPN 2.0.9 Win32-MinGW [SSL] [LZO] built on Oct 1 2006 Tue Oct 26 12:32:48 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:32:48 2010 Control Channel Authentication: using 'ta.key' as a OpenVPN static key file Tue Oct 26 12:32:48 2010 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Oct 26 12:32:48 2010 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Oct 26 12:32:48 2010 LZO compression initialized Tue Oct 26 12:32:48 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:32:48 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:32:48 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:32:48 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:32:48 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:32:48 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 12:32:48 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 12:32:48 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 12:32:49 2010 TLS: Initial packet from 67.228.223.12:3389, sid=bd5f79fe 8475497f Tue Oct 26 12:32:49 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:32:49 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:32:49 2010 TCP/UDP: Closing socket Tue Oct 26 12:32:49 2010 SIGUSR1[soft,tls-error] received, process restarting Tue Oct 26 12:32:49 2010 Restart pause, 5 second(s) Tue Oct 26 12:32:54 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:32:54 2010 Re-using SSL/TLS context Tue Oct 26 12:32:54 2010 LZO compression initialized Tue Oct 26 12:32:54 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:32:54 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:32:54 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:32:54 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:32:54 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:32:54 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 12:32:54 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 12:32:54 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 12:32:54 2010 TLS: Initial packet from 67.228.223.12:3389, sid=1643b931 ce240d5f Tue Oct 26 12:32:54 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:32:54 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:32:54 2010 TCP/UDP: Closing socket Tue Oct 26 12:32:54 2010 SIGUSR1[soft,tls-error] received, process restarting Tue Oct 26 12:32:54 2010 Restart pause, 5 second(s) Tue Oct 26 12:32:59 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:32:59 2010 Re-using SSL/TLS context Tue Oct 26 12:32:59 2010 LZO compression initialized Tue Oct 26 12:32:59 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:32:59 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:32:59 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:32:59 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:32:59 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:33:00 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 12:33:00 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 12:33:00 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 12:33:00 2010 TLS: Initial packet from 67.228.223.12:3389, sid=cd439fb2 d625ca0d Tue Oct 26 12:33:00 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:33:00 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:33:00 2010 TCP/UDP: Closing socket Tue Oct 26 12:33:00 2010 SIGUSR1[soft,tls-error] received, process restarting Tue Oct 26 12:33:00 2010 Restart pause, 5 second(s) Tue Oct 26 12:33:05 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:33:05 2010 Re-using SSL/TLS context Tue Oct 26 12:33:05 2010 LZO compression initialized Tue Oct 26 12:33:05 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:33:05 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:33:05 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:33:05 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:33:05 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:33:06 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 12:33:06 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 12:33:06 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 12:33:06 2010 TLS: Initial packet from 67.228.223.12:3389, sid=28f0cb87 69c90cde Tue Oct 26 12:33:06 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:33:06 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:33:06 2010 TCP/UDP: Closing socket Tue Oct 26 12:33:06 2010 SIGUSR1[soft,tls-error] received, process restarting Tue Oct 26 12:33:06 2010 Restart pause, 5 second(s) Tue Oct 26 12:33:11 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:33:11 2010 Re-using SSL/TLS context Tue Oct 26 12:33:11 2010 LZO compression initialized Tue Oct 26 12:33:11 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:33:11 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:33:11 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:33:11 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:33:11 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:33:11 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 12:33:11 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 12:33:11 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 12:33:12 2010 TLS: Initial packet from 67.228.223.12:3389, sid=128becf9 f62adf0c Tue Oct 26 12:33:12 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 12:33:12 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 12:33:12 2010 TCP/UDP: Closing socket Tue Oct 26 12:33:12 2010 SIGUSR1[soft,tls-error] received, process restarting Tue Oct 26 12:33:12 2010 Restart pause, 5 second(s) Tue Oct 26 12:33:17 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 12:33:17 2010 Re-using SSL/TLS context Tue Oct 26 12:33:17 2010 LZO compression initialized Tue Oct 26 12:33:17 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 12:33:17 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 12:33:17 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 12:33:17 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 12:33:17 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 12:33:20 2010 TCP/UDP: Closing socket Tue Oct 26 12:33:20 2010 SIGTERM[hard,init_instance] received, process exiting Guys I am extremely sorry for not presenting my error Log properly, please forgive me and give me your valuable advice. I am using windows 7 and I am using openvpn mainly to bypass censorship at UAE. I am using only client config file. Ca.crt file is in config folder Thanks and regards Nitin My error Log with Config1 file Tue Oct 26 21:24:34 2010 OpenVPN 2.0.9 Win32-MinGW [SSL] [LZO] built on Oct 1 2006 Tue Oct 26 21:24:46 2010 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Tue Oct 26 21:24:46 2010 Control Channel Authentication: using 'ta.key' as a OpenVPN static key file Tue Oct 26 21:24:46 2010 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Oct 26 21:24:46 2010 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Tue Oct 26 21:24:46 2010 LZO compression initialized Tue Oct 26 21:24:46 2010 Control Channel MTU parms [ L:1544 D:168 EF:68 EB:0 ET:0 EL:0 ] Tue Oct 26 21:24:46 2010 Data Channel MTU parms [ L:1544 D:1450 EF:44 EB:135 ET:0 EL:0 AF:3/1 ] Tue Oct 26 21:24:46 2010 Local Options hash (VER=V4): 'ee93268d' Tue Oct 26 21:24:46 2010 Expected Remote Options hash (VER=V4): 'bd577cd1' Tue Oct 26 21:24:46 2010 Attempting to establish TCP connection with 67.228.223.12:3389 Tue Oct 26 21:24:47 2010 TCP connection established with 67.228.223.12:3389 Tue Oct 26 21:24:47 2010 TCPv4_CLIENT link local: [undef] Tue Oct 26 21:24:47 2010 TCPv4_CLIENT link remote: 67.228.223.12:3389 Tue Oct 26 21:24:47 2010 TLS: Initial packet from 67.228.223.12:3389, sid=4244e662 e5a0572a Tue Oct 26 21:24:47 2010 TLS Error: cannot locate HMAC in incoming packet from 67.228.223.12:3389 Tue Oct 26 21:24:47 2010 Fatal TLS error (check_tls_errors_co), restarting Tue Oct 26 21:24:47 2010 TCP/UDP: Closing socket Tue Oct 26 21:24:47 2010 SIGUSR1[soft,tls-error] received, process restarting client config file: client dev tun proto tcp remote openvpn1.flashvpn.com 3389 float resolv-retry infinite nobind persist-key persist-tun ca ca.crt ns-cert-type server tls-auth ta.key 1 comp-lzo verb 3 mute 20 auth-user-pass route-method exe route-delay 2

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Does the Lenovo t60p vga port support an s-video signal?

- by Matthijs Wessels

I just bought a new television. The problem is it turns out it doesn't have a VGA port. It does have: s-video, component, hdmi and scart. My Lenovo t60p only has vga. If have search frantically for a solution and even though it seems I have sooo many options they are all dead ends. Or I keep ending up having to buy a 100 euro box to convert the signal. However, I found that some video cards support s-video through the vga port. It says look it up in your video cards documentation. I have a Lenovo t60p laptop with a ATI MOBILITY FireGl v5250. But I can't seem to get my hands on any documentation where this is supposed to be documented. I found this website: http://forum.notebookreview.com/showthread.php?t=179529&highlight=s-video There this guy says he thinks it's in the t60 but dropped in the t61, but suggests to the guy with the t60 that it won't work. I can't really conclude anything from that. Furthermore, I am not looking for the best of the best quality. So when I found this: *http://www.amazon.com/VideoSecu-Computor-Presentation-Converter-VGA2TV/dp/B000X3FAJU/ref=pd_cp_e_3_img I woudl be quite happy with this. Except that I don't think I can order it because I don't live in the US. Can anybody give me a definite answer, to whether the vga port of my lenovo t60p ati firegl v5250 supports s-video? So that I can just by a vga to s-video cable to achieve my goal.

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How to set up port forwarding on a dedicated server running CentOS 5.4 to use Ubuntu 9.0.4

- by mairtinh

The basic situation that I have is a dedicated server running CentOS 5.4 At the moment I have one VM running Ubuntu 9.0.4. Later on, I will want to add another VM running Windows Server 2003 but at the moment I am focusing on getting Ubuntu up and running. The Ubuntu installation is working fine but I'm seriously struggling to get port forwarding working so that I can access websites to be hosted on the Ubuntu VM. As a newbie to Linux, I am confused about the relationship between IPTables and VMWare's own port forwarding. Here's what I've tried so far. The IP of my server is xxx.xxx.xxx.xxx and the provider support have told me that the subnet mask is 255.255.255.0, the gateway address is xxx.xxx.xxx.1 and the network address is xxx.xxx.xxx.0. (Those latter two surprise me a bit, I expected private gateway/network address rather than public ones.) First of all I tried Bridged Networking but had no success at all in communicating with the machine other than through the VMware console. I tried pinging it from the host (using ssh into the host) but no joy; also no Inernet access from the VM. I changed the interfaces configuration from DHCP to Static, using a static address of 192.168.1.100 and setting the gateway to xxx.xxx.xxx.1 as advised by the provider. No real difference, still cannot ping the guest from the host or vice versa and no Internet access from the guest. Then I tried NAT. The host automatically set the IP address to 192.168.132.128 with a gateway of 192.168.132.2 Now the guest has Internet access out and when I do a VNC to the host and open Firefox with 192.168.132.128 I can see the hosted website okay but I still cannot get into it from outside. I mentioned that I'm a bit confused about IPtables and VMware port forwarding, what I meant is that I'm not sure whether IPtable forwarding should be set to the IP address of the guest interface (192.168.132.128 in this case) or the gateway address 192.168.132.2 . I have a feeling that I'm missing something very simple here, can anybody tell me what it is?

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Auto DOP and Concurrency

- by jean-pierre.dijcks

After spending some time in the cloud, I figured it is time to come down to earth and start discussing some of the new Auto DOP features some more. As Database Machines (the v2 machine runs Oracle Database 11.2) are effectively selling like hotcakes, it makes some sense to talk about the new parallel features in more detail. For basic understanding make sure you have read the initial post. The focus there is on Auto DOP and queuing, which is to some extend the focus here. But now I want to discuss the concurrency a little and explain some of the relevant parameters and their impact, specifically in a situation with concurrency on the system. The goal of Auto DOP The idea behind calculating the Automatic Degree of Parallelism is to find the highest possible DOP (ideal DOP) that still scales. In other words, if we were to increase the DOP even more above a certain DOP we would see a tailing off of the performance curve and the resource cost / performance would become less optimal. Therefore the ideal DOP is the best resource/performance point for that statement. The goal of Queuing On a normal production system we should see statements running concurrently. On a Database Machine we typically see high concurrency rates, so we need to find a way to deal with both high DOP’s and high concurrency. Queuing is intended to make sure we Don’t throttle down a DOP because other statements are running on the system Stay within the physical limits of a system’s processing power Instead of making statements go at a lower DOP we queue them to make sure they will get all the resources they want to run efficiently without trashing the system. The theory – and hopefully – practice is that by giving a statement the optimal DOP the sum of all statements runs faster with queuing than without queuing. Increasing the Number of Potential Parallel Statements To determine how many statements we will consider running in parallel a single parameter should be looked at. That parameter is called PARALLEL_MIN_TIME_THRESHOLD. The default value is set to 10 seconds. So far there is nothing new here…, but do realize that anything serial (e.g. that stays under the threshold) goes straight into processing as is not considered in the rest of this post. Now, if you have a system where you have two groups of queries, serial short running and potentially parallel long running ones, you may want to worry only about the long running ones with this parallel statement threshold. As an example, lets assume the short running stuff runs on average between 1 and 15 seconds in serial (and the business is quite happy with that). The long running stuff is in the realm of 1 – 5 minutes. It might be a good choice to set the threshold to somewhere north of 30 seconds. That way the short running queries all run serial as they do today (if it ain’t broken, don’t fix it) and allows the long running ones to be evaluated for (higher degrees of) parallelism. This makes sense because the longer running ones are (at least in theory) more interesting to unleash a parallel processing model on and the benefits of running these in parallel are much more significant (again, that is mostly the case). Setting a Maximum DOP for a Statement Now that you know how to control how many of your statements are considered to run in parallel, lets talk about the specific degree of any given statement that will be evaluated. As the initial post describes this is controlled by PARALLEL_DEGREE_LIMIT. This parameter controls the degree on the entire cluster and by default it is CPU (meaning it equals Default DOP). For the sake of an example, let’s say our Default DOP is 32. Looking at our 5 minute queries from the previous paragraph, the limit to 32 means that none of the statements that are evaluated for Auto DOP ever runs at more than DOP of 32. Concurrently Running a High DOP A basic assumption about running high DOP statements at high concurrency is that you at some point in time (and this is true on any parallel processing platform!) will run into a resource limitation. And yes, you can then buy more hardware (e.g. expand the Database Machine in Oracle’s case), but that is not the point of this post… The goal is to find a balance between the highest possible DOP for each statement and the number of statements running concurrently, but with an emphasis on running each statement at that highest efficiency DOP. The PARALLEL_SERVER_TARGET parameter is the all important concurrency slider here. Setting this parameter to a higher number means more statements get to run at their maximum parallel degree before queuing kicks in. PARALLEL_SERVER_TARGET is set per instance (so needs to be set to the same value on all 8 nodes in a full rack Database Machine). Just as a side note, this parameter is set in processes, not in DOP, which equates to 4* Default DOP (2 processes for a DOP, default value is 2 * Default DOP, hence a default of 4 * Default DOP). Let’s say we have PARALLEL_SERVER_TARGET set to 128. With our limit set to 32 (the default) we are able to run 4 statements concurrently at the highest DOP possible on this system before we start queuing. If these 4 statements are running, any next statement will be queued. To run a system at high concurrency the PARALLEL_SERVER_TARGET should be raised from its default to be much closer (start with 60% or so) to PARALLEL_MAX_SERVERS. By using both PARALLEL_SERVER_TARGET and PARALLEL_DEGREE_LIMIT you can control easily how many statements run concurrently at good DOPs without excessive queuing. Because each workload is a little different, it makes sense to plan ahead and look at these parameters and set these based on your requirements.

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SerialPort ReadLine() after Thread.Sleep() goes crazy

- by Mat

Hi everybody, I've been fighting with this issue for a day and I can't find answer for it. I am trying to read data from GPS device trough COM port in Compact Framework C#. I am using SerialPort class (actually my own ComPort class boxing SerialPort, but it adds only two fields I need, nothing special). Anyway.. I am running while loop in a separate thread which reads line from the port, analyze NMEA data, print them, catch all exceptions and then I Sleep(200) the thread, cause I need CPU for other threads... Without Sleep it works fine, but uses 100% CPU.. When I dont use Sleep after few minutes the output from COM port looks like this: GPGSA,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F GSA,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F A,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F ,18,12,271,24,24,05,020,24,14,04,326,25,11,03,023,*76 A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F 3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F 09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F ,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F as you can see the same message is read few times but cut. I wonder what I'm doing wrong... My port configuration: port.ReadBufferSize = 4096; port.BaudRate = 4800; port.DataBits = 8; port.Parity = Parity.None; port.StopBits = StopBits.One; port.NewLine = "\r\n"; port.ReadTimeout = 1000; port.ReceivedBytesThreshold = 100000; And my reading function: private void processGps(){ while (!closing) { //reconnect if needed try { string sentence = port.ReadLine(); //here print the sentence //analyze the sentence (this takes some time 50-100ms) } catch (TimeoutException) { Thread.Sleep(0); } catch (IOException ioex) { //handling IO exception (some info on the screen) } Thread.Sleep(200); } } There is some more stuff in this function like reconnection if the device is lost etc.. but it is not called when the GPS is connected properly.. I was trying port.DiscardInBuffer(); after some blocks of code (in TimeoutException, after read..) Did anyone had similar problem? I really dont know what I'm doing wrong.. The only way to get rig of it is removing the last Sleep... Thanks in advance! Best Regards, Mat

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What happens when several Java servlet apps running on the same port ?

- by Frank

Something strange happened to my servlets and I think I've figured out why, yet I'm more confused. I used Netbean6.7 to develop a Paypal IPN (Instant Payment Notification) message servlet, it listens on port 8080 by default for Paypal IPN messages. I used some sample Java code from it's web site, but when it ran, only about 1 in 10 messages came through, and they looked correct, but why 1 in 10 ? Not 100% or none ? So I asked some questions here and got some advices, one in particular points me to Google's App Engine, so I downloaded it and ran the demo guestbook while my IPN servlet is still running on Netbeans, the strange thing happened, after I entered "appengine-java-sdk-1.3.2\bin\dev_appserver.cmd appengine-java-sdk-1.3.2\demos\guestbook\war" from the command prompt, I went to the following url on my browser "http://localhost:8080/", I thought I would see the Google demo guestbook page, NO, what I saw was another servlet I developed 2 years ago : "Web Academy", online course registration app. How can that happen ? I never started it, and I haven't touch that project for years. I guess because it's also listening on port 8080, so now I understand why the IPN messages only came through 1 in 10 times, because another servlet was also listening on that port and could have got the messages intended for IPN, or some how those two servlets' processes mixed up and therefore couldn't respond to Paypal properly, and failed. In order to verify some of my guesses, I turn off Netbeans, and ran the Google guestbook again at the prompt, this time on my browser http://localhost:8080/ points to the demo guestbook page. My Urls look like this : [A] Paypal IPN : http://localhost:8080/PayPal_App/PayPal_Servlet [B] Web Academy : http://localhost:8080/ So now, my questions are : <1> Why the "Web Academy" servlet was auto started when I ran the Paypal servlet ? <2> If I change the IPN listening port to 8083, would that mean I can run both of them on my PC at the same time without affecting each other ? <3> But I still don't understand, [A] and [B] look different, if a page for [A] is refreshed, it should show the Paypal content, and another page looking at [B] should show the Web Academy content, and that's exactly what happens when I started Netbeans to run the Paypal servlet, both pages show their respective content correctly side by side without interfering with each other, how come the IPN messages couldn't get through 100% of the time ? <4> In Netbeans how to assign 8080 to servlet [A] and assign port 8083 to servlet [B] ? <5> How to turn off auto start of Web Academy by Netbeans ?

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Does Java 6 open a default port for JMX remote connections?

- by Bob Cross

My specific question has to do with JMX as used in JDK 1.6: if I am running a Java process using JRE 1.6 with com.sun.management.jmxremote in the command line, does Java pick a default port for remote JMX connections? Backstory: I am currently trying to develop a procedure to give to a customer that will enable them to connect to one of our processes via JMX from a remote machine. The goal is to facillitate their remote debugging of a situation occurring on a real-time display console. Because of their service level agreement, they are strongly motivated to capture as much data as possible and, if the situation looks too complicated to fix quickly, to restart the display console and allow it to reconnect to the server-side. I am aware the I could run jconsole on JDK 1.6 processes and jvisualvm on post-JDK 1.6.7 processes given physical access to the console. However, because of the operational requirements and people problems involved, we are strongly motivated to grab the data that we need remotely and get them up and running again. EDIT: I am aware of the command line port property com.sun.management.jmxremote.port=portNum The question that I am trying to answer is, if you do not set that property at the command line, does Java pick another port for remote monitoring? If so, how could you determine what it might be?

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Creating a HTTP handler for IIS that transparently forwards request to different port?

- by Lasse V. Karlsen

I have a public web server with the following software installed: IIS7 on port 80 Subversion over apache on port 81 TeamCity over apache on port 82 Unfortunately, both Subversion and TeamCity comes with their own web server installations, and they work flawlessly, so I don't really want to try to move them all to run under IIS, if that is even possible. However, I was looking at IIS and I noticed the HTTP redirect part, and I was wondering... Would it be possible for me to create a HTTP handler, and install it on a sub-domain under IIS7, so that all requests to, say, http://svn.vkarlsen.no/anything/here is passed to my HTTP handler, which then subsequently creates a request to http://localhost:81/anything/here, retrieves the data, and passes it on to the original requestee? In other words, I would like IIS to handle transparent forwards to port 81 and 82, without using the redirection features. For instance, Subversion doesn't like HTTP redirect and just says that the repository has been moved, and I need to relocate my working copy. That's not what I want. If anyone thinks this can be done, does anyone have any links to topics I need to read up on? I think I can manage the actual request parts, even with authentication, but I have no idea how to create a HTTP handler. Also bear in mind that I need to handle sub-paths and documents beneath the top-level domain, so http://svn.vkarlsen.no/whatever/here needs to be handled by a single handler, I cannot create copies of the handler for all sub-directories since paths are created from time to time.

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