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• Lost network on ubuntu server

  - by user1838473

  I have a virtual machine on Vsphere 5.0 running Ubuntu 12.04 when i put dinamic IP (/etc/network/interfaces) iface eth0 inet dhcp Ubuntu have network and i can do ping to google for example (8.8.8.8) but when i put static IP and configure resolv.conf My interfaces file: auto eth0 iface eth0 inet static address 192.168.1.54 gateway 192.168.1.1 netmask 255.255.255.0 it lost the network and i cant do ping to anything...i dont understand where is the problem... Thanks a lot

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• Connecting mySQL to MSSQL

  - by user180198

  I need a little advise, I need to sync a DB that is currently on a Server 2008(SQL Server 2005) machine and I use Studio Express to connect to it. I need a way of syncing this DB to mysql that lives on a NAS on the same network: Local: DB Engine on server, named, server\sqlexpress and IP = 10.0.0.201 Target: DB on NAS, named, CISCO-NAS and IP = 10.0.0.182 Will need for this to sync every few mins... I really don't know how to start.

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• How to conncet(join) host laptop to the guset 2k8 server [closed]

  - by Dawood Said

  Dear brother I have core i5 laptop with wireless ip " 192.168.3.102", and I installed virtulbx in my laptop.In the virtualbox I made a network of two virtual machine W2k8 and window xp of ip's 192.168.3.200 and 192.168.3.201 respectively with " internal network" option from virtulabox. Now i want to coonet the host laptop to this virtual network and also wnat that the internet is running on the laptop . Is it possible please help me in this regard

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• What is the best way/tool to analyze raw data(network stats) from Simulation?

  - by user90500

  After running a simulation(using a simulator(QualNet)) of a simulated network I end up with ip stats stored in a database, I then extract the data to a csv file So now I have 750mb of raw network stats(time stamp, packet id, source ip, source port, protocol, etc). What are the common ways of analyzing large amounts of data like above, if you want to know things like packet loss, throughput, delay, congestion, etc.

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• DD-WRT RIP2 Router mode configuration

  - by Eduardo

  Can anybody tell me why my wireless router only redirects traffic to ADSL modem when it is on Gateway mode? These are the configurations when it is on RIP2 Router mode: ADSL Modem: ------------ LAN IP: 10.1.1.1 Subnet mask: 255.0.0.0 RIP v2 enabled in both directions Route: destination: 192.168.1.0 Subnet mask: 255.255.255.0 Gateway: 10.1.1.2 Wireless Router (DD-WRT) ------------------------ WAN IP: 10.1.1.2 WAN Subnet mask: 255.0.0.0 LAN IP: 192.168.1.1 LAN Subnet mask: 255.255.255.0 Operating mode: RIP2 Router Static Route: Destination LAN NET: 10.0.0.0 Subnet Mask: 255.0.0.0 Gateway: 10.1.1.1 Interface: LAN & WLAN

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• Windows LiveID "Couldn't sign you out" error at sign-out

  - by Jason

  I'm implementing LiveID authentication on my website. I've done it before, but not on this particular platform, MojoPortal. The sign-in works properly, but when I attempt to sign-out, I get the error message quoted below. My browser is not blocking cookies. I get the same message when logging in to and out of, say, MSDN with a LiveID too now. I can't figure out if there's something about my site's programming that is interfering with the sign-out process of LiveID (since I believe that all (recent?) websites get sent a sign-out command) OR if live.com is just having issues lately and this is a coincidence. Couldn't sign you out We couldn't sign you out because your browser is blocking cookies. To sign out, close all of your browser windows. To keep this from happening again, change your browser's settings to allow cookies. If you don't know how to do that, see your browser's help.

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• Locking Cache Key without Locking the entire Cache

  - by Gandalf

  I have servlets that caches user information rather then retrieving it from the user store on every request (shared Ehcache). The issue I have is that if a client is multi-threaded and they make more then one simultaneous request, before they have been authenticated, then I get this in my log: Retrieving User [Bob] Retrieving User [Bob] Retrieving User [Bob] Returned [Bob] ...caching Returned [Bob] ...caching Returned [Bob] ...caching What I would want is that the first request would call the user service, while the other two requests get blocked - and when the first request returns, and then caches the object, the other two requests go through: Retrieving User [Bob] blocking... blocking... Returned [Bob] ...caching [Bob] found in cache [Bob] found in cache I've thought about locking on the String "Bob" (because due to interning it's always the same object right?). Would that work? And if so how do I keep track of the keys that actually exist in the cache and build a locking mechanism around them that would then return the valid object once it's retrieved. Thanks.

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• Issue reading packets from a pcap file. dpkt

  - by Chris

  I am running the following test script to try to read packets from a sample .pcap file I have downloaded. import socket import dpkt import sys pcapReader = dpkt.pcap.Reader(file("test1.pcap", "rb")) for ts, data in pcapReader: ether = dpkt.ethernet.Ethernet(data) if ether.type != dpkt.ethernet.ETH_TYPE_IP: raise ip = ether.data src = socket.inet_ntoa(ip.src) dst = socket.inet_ntoa(ip.dst) print "%s -> %s" % (src, dst) For some reason, this is not being interpreted properly. When running it, I get KeyError: 138 module body in test.py at line 4 function __init__ in pcap.py at line 105 Program exited. Why is this? What's wrong?

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• How to config socket connect timeout in C#

  - by ninikin

  (C# )When the Client tries to connect to a disconnected IP address, there is a long timeout over 15 seconds... How can we reduce this timeout? What is the method to config it? The code I'm using to set up a socket connection is as following: try { m_clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPAddress ip = IPAddress.Parse(serverIp); int iPortNo = System.Convert.ToInt16(serverPort); IPEndPoint ipEnd = new IPEndPoint(ip, iPortNo); m_clientSocket.Connect(ipEnd); if (m_clientSocket.Connected) { lb_connectStatus.Text = "Connection Established"; WaitForServerData(); } else { } } catch (SocketException se) { lb_connectStatus.Text = "Connection Failed"; MessageBox.Show(se.Message); }

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• How do you read a segfault kernel log message.

  - by Sullenx

  This can be a very simple question, I'm am attempting to debug an application which generates the following segfault error in the kern.log /var/log/kern.log.0:Jan 8 13:25:56 myhost kernel: myapp[15514]: segfault at 794ef0 ip 080513b sp 794ef0 error 6 in myapp[8048000+24000] Here are my questions: 1) Is there any documentation as to what are the diff error numbers on segfault, in this instance it is error 6, but i've seen error 4, 5 2) What is the meaning of the information at bf794ef0 ip 0805130b sp bf794ef0 and myapp[8048000+24000]? So far i was able to compile with symbols, and when i do a "x 0x8048000+24000" it returns a symbol, is that the correct way of doing it? My assumptions thus far are the following: sp = stack pointer? ip = instruction pointer at = ???? myapp[8048000+24000] = address of symbol?

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• How to deploy a Java web application? [closed]

  - by Yatendra Goel

  I have developed a Java Web Application and I want to show it to my client by hosting it on a server. I tried to run it on my localpc through web-browser and it worked fine. I gave the hostname as "localhost" in the URL of my webApplication. Now I want to show it to my client who is on other computer on internet. I tried to replace the "localhost" from my webApplication's url to my current ip address. But when I put that URL on my own browser, it didn't work. How can I show that web-application to my client. I have my own domain name but do not own any web-hosting. I don't want to purchase a web-hosting plan. One more problem: I don't have static IP address. My IP changes almost everytime when I connect to my ISP.

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• How to launch a remote process through ssh and end the connection?

  - by Lukasz Lew

  This is still blocking: ssh host nohup cmd This still leaves the connection open: ssh host nohup cmd &

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• How to sketch out an event-driven system?

  - by Jordan

  I'm trying to design a system in Node.js (an attempt at solving one of my earlier problems, using Node's concurrency) but I'm running into trouble figuring out how to draw a plan of how the thing should operate. I'm getting very tripped up thinking in terms of callbacks instead of returned values. The flow isn't linear, and it's really boggling my ability to draft it. How does one draw out an operational flow for an event-driven system? I need something I can look at and say "Ok, yes, that's how it will work. I'll start it over here, and it will give me back these results over here." Pictures would be very helpful for this one. Thanks. Edit: I'm looking for something more granular than UML, specifically, something that will help me transition from a blocking and object-oriented programming structure, where I'm comfortable, to a non-blocking and event driven structure, where I'm unfamiliar.

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• Create View using Linked Server db in SQL Server

  - by Muhammad Kashif Nadeem

  How can I create View on Linked Server db. For Example I have a linked server [0.0.0.0] on [1.1.1.1]. Both db servers are SQL Sserver 2005. I want to create View on [1.1.1.1] using table on linked server. EDIT: On creating using full name, [0.0.0.0].db.dbo.table, I am getting this error. SQL Execution Error. Executed SQL statement: SELECT * FROM 0.0.0.0.db.dbo.table (YOu can see brackets are not there.) Error Source: .Net SqlClient Data Provider Error Message: Incorrect syntax near '0.0'. --- part of IP address. I am just creating this in ManagementStudio, not using it because it is not created yet. I Have changed IP. In image you can see there are not brackets around IP but I given it and on error these brackets are removed. Thanks.

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• Asynchronous subprocess on Windows

  - by Stigma

  First of all, the overall problem I am solving is a bit more complicated than I am showing here, so please do not tell me 'use threads with blocking' as it would not solve my actual situation without a fair, FAIR bit of rewriting and refactoring. I have several applications which are not mine to modify, which take data from stdin and poop it out on stdout after doing their magic. My task is to chain several of these programs. Problem is, sometimes they choke, and as such I need to track their progress which is outputted on STDERR. pA = subprocess.Popen(CommandA, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE) # ... some more processes make up the chain, but that is irrelevant to the problem pB = subprocess.Popen(CommandB, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=pA.stdout ) Now, reading directly through pA.stdout.readline() and pB.stdout.readline(), or the plain read() functions, is a blocking matter. Since different applications output in different paces and different formats, blocking is not an option. (And as I wrote above, threading is not an option unless at a last, last resort.) pA.communicate() is deadlock safe, but since I need the information live, that is not an option either. Thus google brought me to this asynchronous subprocess snippet on ActiveState. All good at first, until I implement it. Comparing the cmd.exe output of pA.exe | pB.exe, ignoring the fact both output to the same window making for a mess, I see very instantaneous updates. However, I implement the same thing using the above snippet and the read_some() function declared there, and it takes over 10 seconds to notify updates of a single pipe. But when it does, it has updates leading all the way upto 40% progress, for example. Thus I do some more research, and see numerous subjects concerning PeekNamedPipe, anonymous handles, and returning 0 bytes available even though there is information available in the pipe. As the subject has proven quite a bit beyond my expertise to fix or code around, I come to Stack Overflow to look for guidance. :) My platform is W7 64-bit with Python 2.6, the applications are 32-bit in case it matters, and compatibility with Unix is not a concern. I can even deal with a full ctypes or pywin32 solution that subverts subprocess entirely if it is the only solution, as long as I can read from every stderr pipe asynchronously with immediate performance and no deadlocks. :)

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• DataMapper is only returning the last part of this query

  - by Josh K

  So I'm using the following: $r = new Record(); $r->select('ip, count(*) as ipcount'); $r->group_by('ip'); $r->order_by('ipcount', 'desc'); $r->limit(5); $r->get(); foreach($r->all as $record) { echo($record->ip." "); echo($record->ipcount." <br />"); } And I only get the last (fifth) record echo'ed out and no ipcount echoed. Is there a different way to go around this? I'm working on learning DataMapper (hence the questions) and need to figure some of this out. I haven't quite wrapped my head around the whole ORM thing.

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• prevent bots to query my database several times

  - by Alain

  Hi all, I'm building an application that is a kind of registry. Think about the dictionary: you lookup for a word and it return something if the word is founded. Now, that registry is going to store valuable informations about companies, and some could be tempted to get the complete listing. My application use EJB 3.0 that replies to WS. So I was thinking about permits a maximum of 10 query per IP address per day. Storing the IP address and a counter on a table that would be empty by a script every night. Is it a good idea/practice to do so? If yes, how can I get the IP address on the EJB side? Is there a better way to prevent something to get all the data from my database? I've also though about CAPTCHA but I think it's a pain for the user, and sometime, they are difficult to read even for real human. Hope it's all clear since I'm not english... Thanks Alain

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• Crossdomain file edit

  - by Misiur

  Hi there. I need to know, where from is my script used (it's for sale, and i don't want any thiefs). I want to write on my server in file, IP of user, domain where from script has been runned, date, etc. I've tried fopen, fwrite, but is_file_writable returned that it isn't. File CHmods are 777, it parent catalog has too 777 chmods. Now i'm trying something like that: <?php $file = 'http://www.misiur.com/security/seal.txt'; $data = date("Y-m-d H:i:s"); $ip = $_SERVER['REMOTE_ADDR']; $svr = $_SERVER['SERVER_NAME']; $str = "[$data] Loaded by $ip at $svr\r\n"; $current = file_get_contents($file); $current .= $str; file_put_contents($file, $current); ?> However - nothing happens. What i've got to do?

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• How to log with Ruby and eventmachine?

  - by Justin

  I'm writing an application using Ruby and the Eventmachine library. I really like the idea of non blocking I/O and event driven systems, the problem I'm running into is logging. I'm using Ruby's standard logger library. Its not that logging takes forever but it seems like something that shouldn't block and it does. Is there a library out there somewhere that extends Ruby's standard logger implementation to be non-blocking or should I just call EM::defer for my logging calls? Is there a way I can make eventmachine do this for me already?

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• How to run an application as root without asking for an admin password?

  - by kvaruni

  I am writing a program in Objective-C (XCode 3.2, on Snow Leopard) that is capable of either selectively blocking certain sites for a duration or only allow certain sites (and thus block all others) for a duration. The reasoning behind this program is rather simple. I tend to get distracted when I have full internet access, but I do need internet access during my working hours to get to a number of work-related websites. Clearly, this is not a permanent block, but only helps me to focus whenever I find myself wandering a bit too much. At the moment, I am using a Unix script that is called via AppleScript to obtain Administrator permissions. It then activates a number of ipfw rules and clears those after a specific duration to restore full internet access. Simple and effective, but since I am running as a standard user, it gets cumbersome to enter my administrator password each and every time I want to go "offline". Furthermore, this is a great opportunity to learn to work with XCode and Objective-C. At the moment, everything works as expected, minus the actual blocking. I can add a number of sites in a list, specify whether or not I want to block or allow these websites and I can "start" the blocking by specifying a time until which I want to stay "offline". However, I find it hard to obtain clear information on how I can run a privileged Unix command from Objective-C. Ideally, I would like to be able to store information with respect to the Administrator account into the Keychain to use these later on, so that I can simply move into "offline" mode with the convenience of clicking a button. Even more ideally, there might be some class in Objective-C with which I can block access to some/all websites for this particular user without needing to rely on privileged Unix commands. A third possibility is in starting this program with root permissions and the reducing the permissions until I need them, but since this is a GUI application that is nested in the menu bar of OS X, the results are rather awkward and getting it to run each and every time with root permission is no easy task. Anyone who can offer me some pointers or advice? Please, no security-warnings, I am fully aware that what I want to do is a potential security threat.

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• Issue reading packets from a pcap file. dpkt module. What gives?

  - by Chris

  I am running the following test script to try to read packets from a sample .pcap file I have downloaded. It won't seem to run. I have all of the modules, but no examples seem to be running. import socket import dpkt import sys pcapReader = dpkt.pcap.Reader(file("test1.pcap", "rb")) for ts, data in pcapReader: ether = dpkt.ethernet.Ethernet(data) if ether.type != dpkt.ethernet.ETH_TYPE_IP: raise ip = ether.data src = socket.inet_ntoa(ip.src) dst = socket.inet_ntoa(ip.dst) print "%s -> %s" % (src, dst) For some reason, this is not being interpreted properly. When running it, I get KeyError: 138 module body in test.py at line 4 function __init__ in pcap.py at line 105 Program exited. Why is this? What's wrong?

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• Any way to get read timeouts with Java NIO/selectors?

  - by mmebane

  I'm converting a Java server application which used blocking IO and thread-per-client to NIO and a single IO thread (probably a thread pool after I get the basic implementation done). The one thing I am having an issue with is disconnecting clients after they have been idle for a period. I had previously been using SO_TIMEOUT and blocking reads. However, with selector-based IO, reads don't block... I was hoping that I'd be able to set a timeout and be able to select on read timeout, with something like SelectionKey.isReadTimeout(), but nothing like that seems to exist. The current best solution I have come up with is to have a Timer with a TimerTask which keeps track of the keys which are waiting on read, and then canceling them and re-scheduling them on each read. Is there a better solution?

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• May the FileInputStream.available foolish me?

  - by Tom Brito

  This FileInputStream.available() javadoc says: Returns an estimate of the number of remaining bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes. In some cases, a non-blocking read (or skip) may appear to be blocked when it is merely slow, for example when reading large files over slow networks. I'm not sure if in this check: if (new FileInputStream(xmlFile).available() == 0) can I rely that empty files will always return zero?

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• Twitter API and rate limiting - I am confused

  - by jeffreyveon

  I am new to the Twitter API, and I looked at their whitelisting policies and I am a little confused... I'm basically writing a twitter aggregrator that crawls the public tweets of a set of users (not more than 200) hourly. I wanted to apply for whitelisting, and they seem to offer account based and IP based whitelisting. Since I am using a shared hosting, my outbound IP address might vary (and twitter does'nt allow IP ranges for whitelisting). So I am considering using account based whitelisting. However, while using OAuth, is it possible for me to use account based whitelisting for a background process that crawls the API hourly?

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• How to verify mail origin?

  - by MrZombie

  I wish to code a little service where I will be able to send an e-mail to a specific address used by my server to send specific commands to my server. I'll check against a list of permitted e-mail addresses to make sure no one unauthorized will send a command to the server, but how do I make sure that, say, an e-mail sent by "[email protected]" really comes from "thezombie.net"? I thought about checking the header for the original e-mail server's IP and pinging the domain to make sure it is the same, but would that be reliable? Example: Server receives a command from [email protected] [email protected] is authorized, proceed with checks Server checks "thezombie.net"'s IP from the header: W.X.Y.Z Server pings "thezombie.net" for it's IP: A.B.C.D The IPs do not correspond, do not process command Is there any better way to do that?

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