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• Packet Crafting on a Mac

  - by JayCrossler

  I think (based on searching the forums), that NetCat is the best option, but wanted to hear if others are preferable. Anyone have good success with a packet-crafting tool (specifically on Mac)? I've tried HPing, but had some issues. I'm looking into NetCat ('nc' on mac) now, but it's not working as I had thought. Basically, I captured some packets that a remote control sends over a wifi network to turn lights on and off (using X10 controllers), and am looking for a way to replay them by crafting a TCP packet from the command line. I used Wireshark to sniff the traffic, so I know the package is: DEVICE -sendplc-"C4 DIM 10" I'm trying: echo 'DEVICE -sendplc-"C4 DIM 10"' nc 192.168.2.196 6003 but there's no response from the receiving system. The exact bytestream is (if anyone wants to check that I got the right dataframe): 08004642f1b400260897ad6308004500004b08e240004006aaf5c0a802c1c0a802c4d8d7177399aab39 e57ff4753801880ae37ea00000101080a323353ce01b406424445564943457e73656e64706c637e2243 34204f4e220a Next step I'm going to check is to make sure the packet arrives exactly by sniffing and compare it to the original. [EDIT: Also at ServerFault now: Packet Crafting on a Mac, so this one becomes a duplicate across the two sites]

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• How do I determine if a packet is RTP/RTCP?

  - by Chris Holmes

  I am using SharpPCap which is built on WinPCap to capture UDP traffic. My end goal is to capture the audio data from H.323 and save those phone conversations as WAV files. But first thing is first - I need to figure out what my UDP packets are crossing the NIC. SharpPCap provides a UdpPacket class that gives me access to the PayloadData of the message. But I am unsure what do with this data. It's a Byte[] array and I don't know how to go about determining if it's an RTP or RTCP packet. I've Googled this topic but there isn't much out there. Any help is appreciated.

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• Wrangling Control of HTTP Headers in ASP.NET

  - by Andrew Burgess

  I'm working with ASP.NET MVC3, and I'm trying to get absolute control over my headers because a client application that I'm working with expects a very specific content type. What I'm finding when using Fiddler to examine the HTTP traffic is that the text encoding is being returned as part of the header. For example, the client is expecting application/appname in the Content-Type header, but the server is returning application/appname; charset=utf-8. I think the client is using a strict comparison for checking the type, so I want to be able to specify exactly what is emitted in the headers. Right now I have a custom ActionResult in which I clear the headers and then specify only the content type, but the encoding still seems to be added on. How can I remove the encoding from the Content-Type header?

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• google analytics not logging refer ~ have i done something wrong?

  - by calum

  probably something simple how do i get google analytics to detect traffic that comes from a website that redirects to another? i.e someone visits www.abc.com, and are redirected to another site <?php header("Location:www.cde.com"); ?> how do i track these hits? nothing comes up..as i guess it's not strictly a "referrer". hope this makes sense..thanks or is there a better way to do this? I want to track hits on anyone visiting domain X, which redirects to another site. Essentially we are doing a radio campaign with this new domain and would like to measure its effectiveness. thanks

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• What are the names of network interfaces on the Motorola CLIQ?

  - by RS

  The network interfaces on Android interfaces are listed as directories in the file system in /sys/class/net/. For most Android devices the network interface for gprs traffic is called rmnet0 and for Wi-Fi it's usually eth0 or tiwlan0. I suspect that the cell interface for the Motorola CLIQ is rmnet0, but I would like to have this confirmed + know the name of the Wi-Fi interface. Also it would be good to know the device id for this model. This is the value available as android.os.Build.DEVICE in the Java SDK. (E.g. T-Mobile G1 uses dream, Samsung Galaxy uses GT-I7500, and Motorolda Droid uses sholes.)

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• Can a Linksys Router be the cause of bad speeds on a 1.5 mbps link.

  - by gramware

  We use a Linksys 5-port router at a smal organization with about 20 employees. We recently acquired a 1.5 mbps fibre link, but sometimes the link goes down and speeds are still low. On enquirey from the ISP, this was part of the response, However there maybe throttling due to the router in place. A Linksys is a low end router and may be unable to carried traffic of up to 1536Kbps. We are in a position to deploy a Cisco 871 router on test for 2 wks to eliminate that possibility. Also kindly advise the destination of the ping results they look to high. How true is that about the router throttling the network and need for a bigger one.

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• Using TCP Acks to measure latency to a server?

  - by Ted Graham

  I am trying to measure latency to a server that I don't control. This is in a colocated environment, so the latency is on the order of 500 us (.5 ms). I understand that Cisco gear frequently deprioritizes ICMP traffic, making ping times unreliable. Is there a way for me to tell if this is the case on the gear I am traversing? Can I use TCP acknowledgements to determine the minimum latency to the remote server? To do this, I would somehow need to force the remote server to send a TCP ack immediately on receiving my data.

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• Different Versions of an application in same java application server

  - by Cem

  Hi, We are utilizing citrix netscalar with more than 20 glassfish java application servers. Unfortunately we have to remove previous application before deploying a new version of it since we have same context for these two different application. This error-prone process leads some problems due to lack of attention in builds or other problems. In an urgent case, we simply want to redirect to all traffic to previous application. What is the best practice to run different version of an application in a substantial number of servers in same time? Thanks

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• Apache or Nginx for php behind Varnish

  - by Macindy

  We are managing a heavy traffic php site (driven with vbulletin). To get less load I use the cache-proxy varnish. Works very well - with varnish the load was reduced by 50%. But now I am thinking about which webserver to use behind varnish. 90% requests getting to the webserver are php-requests. So is there a difference between apache/mpm-prefork with mod_php and nginx/php-fpm? Is apache perhaps better, because it doesn't have the tcp overhead? Thanks for reply - benchmarks would be great! macindy

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• Book recommendation for learning server management and Apache

  - by japancheese

  Hello, I'm currently managing a site that I feel could be optimized and utilized to be much faster, however, I'm having difficulty finding reliable information to do it. I find the Apache documentation to be a hard read, and too technical about things I don't have a strong grasp on. I'm just looking for a good beginner/intermediate book about server administration to learn as much as possible about Apache, as well as how to create a nice secure, robust server that doesn't crash at the first hint of unusual traffic surges. Thanks to anyone who can point me in the right direction.

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• Switching to a VPS

  - by Damian

  Well, I know absolutely nothing about the subject, so I really need help. I currently have a website running on google app-engine (Java) and I can't get it to what I want because of app engine's limitations (no full text search mainly). The traffic is low, never reached 15% of the free quota (around 1500 daily pageviews). I also have 3 sites in drupal hosted in a shared hosting service, and this is giving me problems, because the server speed is awful. The sites are VERY low trafic, but load times are bad, and I might need to add more sites for some clients, so this will only get worse. So, i'm planning to move all that to VPS. The question is, can I have 2 http servers running in the same VPS? because I will need Apache-php-drupal server and a java server (tomcat?). I have really no idea on this, so any tip will be very helpful to me. Thanks!

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• How can I monitor if a cookie is being sent to a domain other than the one it originated from?

  - by Brendan Salt

  I am trying to write a program that will verify that all cookies sent out from the machine are in fact going to the domain they came from. This is part of a larger security project to detect cookie based malicious attacks (such as XSS). The main snag for this project is actually detecting the out-going cookies. Can someone point me in the right direction for monitoring out-going HTTP traffic for cookie information? Other information about the project: This is a windows application written in C and numerous scripting languages. Thanks so much for the help.

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• Building highly scalable web services

  - by christopher-mccann

  My team and I are in the middle of developing an application which needs to be able to handle pretty heavy traffic. Not facebook level but in the future I would like to be able to scale to that without massive code re-writes. My thought was to modularise out everything into seperate services with their own interfaces. So for example messaging would have a messaging interface that might have send and getMessages() as methods and then the PHP web app would simply query this interface through soap or curl or something like that. The messaging application could then be any kind of application so a Java application or Python or whatever was suitable for that particular functionality with its own seperate database shard. Is this a good approach?

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• How to negotiate red5 connection parameters for streaming with JAVA

  - by baba

  Hi, I have been creating a thin browser client (on java) that sends an RTMP stream to a specified red5 instance. I also use RTMP Researcher to monitor the traffic and events that occur between the client and the server. Here is what I note: There is obviously a map with options that is being exchanged between the red5 instance and the client. You can see it here: (direct link : http://img716.imageshack.us/img716/661/newbitmapimagelb.png ) What I am wondering about is is there a programmatic way to obtain this map in the client side and maybe change some of the parameters or just examine them Edit: I am connecting like this connect ( host, port, app, callback ); . I assume I am sending some default parameters along, because the other connect methods have also an optionsMap as an argument. I was wondering what are the possible values that could be put in such an optionsMap and where to obtain a list of them?

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• mongodb read/write performance and mongo hosting in the cloud

  - by z3cko

  we are currently developing a high traffic rails application with facebooker (facebook game). since amazon simpledb (aws-sdb) is really slow, we are thinking of using a dedicated mongodb server as offered by mongoHQ for example. questions: what is the read/writes peak value for a mongodb server running on a amazon ec2 instance? what would be a recommended setup for a ec2 hosted app with mongodb - a master on amazon EBS and replicas on the ec2 instances? any examples or experiences? is there a company that offers mongodb hosting in the cloud? thanks, mz

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• Avoiding problem of overwriting files which are in use

  - by zaf

  For example on a high traffic web server. To reduce problems when switching a file I usually rename the old file out and then rename in the new file. I was told some time ago that renaming a file does not change the 'inode data' so that processes reading the file can keep doing so without glitches. And, of course, rather than copying in the new file it is faster and safer to rename a temp copy. Is this still best practice and if not what do you do?

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• Weird result with apache vs lighttpd in reverse proxy.

  - by northox

  I have an Apache server running in reverse proxy mode in front of a Tomcat java server. It handle HTTP and HTTPS and send those request back and forth to the Tomcat server on an internal HTTP port. I'm trying to replace the reverse proxy with Lighttpd. Here's the problem: while asking for the same HTTPS url, while using Apache as the reverse proxy, the Tomcat server redirect (302) to an HTTPS page but with Lighttpd it redirect to the same page in HTTP (not HTTPS). What does Lighttpd could do different in order to have a different result from the backend server? In theory, using Apache or Lighttpd server as a reverse proxy should not change anything... but it does. Any idea? I'll try to find something by sniffing the traffic on the backend tomcat server.

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• Keeping a large volume of data in Session - Suggestions / alternatives?

  - by Fishcake

  I'm developing a web app for which the client wants us to query their data as little as possible. The data will be coming from a Microsoft CRM instance. So we've agreed that data will only be queried as and when it is needed, therefore if a web user wants to see a list of contacts (for example) that list is fetched into a local DataTable. Then if a new contact is created on the website the new contact is sent to CRM and added to the local DataTable at the same time. Likewise for edits. If the user then looks at their contacts again the data will just come from the local DataTable. At the moment local data is being kept in Session but my concern is that too much memory will start being used up. However traffic is expected to be pretty small, perhaps no more than 20 concurrent users so am I worrying about nothing or is there a better way you can suggest to handle this?

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• Cloud Database Service Latency/Performance

  - by Gcoop

  Hi All, I am running a heavy traffic site and our server is beginning to get to its limits, at the moment the entire LAMP stack is on one box (not ideal). I would like to move the database onto it's own box or onto a cloud service, but from my previous experience moving the database off the same box as the webserver increases the latency of reads quite dramatically slowing down the site. Is using a cloud service for this going to overcome this problem, because as far as I can tell its essentially the same situation (as moving it onto a separate box in my control)? In which case why is there so much popularity around cloud based database services at the moment? Are cloud based database services so quick that the latency of reads is so low that its almost like having it on the same box in the same datacentre?

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• Is there a sample set of web log data available for testing analysis against?

  - by Peter

  Sorry if this isn't strictly speaking a programming question, but I figure my best chance of success would be to ask here. I'm developing some web log file analysis algorithms, but to date I only have access to a fairly small amount of web log data to process. One algorithm I want to use makes some assumptions about 'the shape' of typical web log data, and so I'd like to test it against a larger 'exemplar' - perhaps the logs of a busy site with a good distribution of traffic from different sources etc. Is there a set of such data available somewhere? Thanks for any help.

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• Two versions of same asp.net app using same server as stateserver - bad?

  - by MGOwen

  We have 2 production web servers for our web app, load balanced to handle lots of traffic. We also have a similar setup for testing. Test pool: [TEST 1]---[TEST 2] Prod pool: [PROD 1]---[PROD 2] When comparing the Web.Config of the app versions (test vs live) I discovered something surprising: both pools have the same value for stateConnectionString. If I understand right, this means they are using the same state server: <sessionState mode="StateServer" stateConnectionString="tcpip=123.123.123.123:42424" cookieless="false" timeout="30"/> Is this a problem? (How does the state server not confuse the two pools)? I was having odd only-sometimes slowdown/errors on the test server, that's why I was looking at this in the first place, but the prod pool runs fine...

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• Tomcat Clustering and HTTPS Issue

  - by Angelo

  Hi I have two instances of Tomcat 6 with content accessible via HTTP and HTTPS for other pages. I have configured the instances this way: 1) Instance one to listen on port 8080(Http) and 8443(Https) 2) Instance two to listen on port 7080(Http) and 7443(Https) I have mod_proxy configured with Apache 2.2 to do clustering. The requests are coming in properly and all works well for HTTP traffic but when you are in the app and it becomes HTTPS then i get the page cannot be found when tomcat tries to serve the page. Now if I access the two tomcat instances directly bypassing the load balancer then everything is fine. So http/https is configured properly on tomcat but not on Apache. I have a feeling i must configure Apache to handle this(or mod_proxy). Thanks,

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• Simple string encryption in .NET and Javascript

  - by jonathanconway

  I'm developing an ASP.NET MVC application in which I want to encrypt a short string on the server, using C#, and send it to the client-side. Then on the client-side it will be decrypted through Javascript code. Any thoughts on how to implement this? Do you know of a simple encryption algorithm (doesn't have to be bullet-proof secure) that can be easily translated from C# to Javascript or vice-versa? NOTE: I could do this entirely in C# and do the decryption through Ajax, but I'd prefer not to do it this way, as I want to reduce website traffic as much as possible.

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• Web Application Nat Traversal

  - by pbreault

  We are deploying web applications in java using tomcat on client machines across the country. Once they are installed, we want to allow a remote access to these web applications through a central server, but we do not want our clients to have to open ports on their routers. Is there a way to tunnel the http traffic in a way that the central server can access the web application that is behind the firewall ? The central server has a static ip address and we have full control over it. We don't need to access the filesystem, we only want to access the web application itself through a browser.

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• List of private iPhone APIs?

  - by diego nunes

  . . Hi there, everybody. . . I need to do an app to be distributed ad hoc (it doesn't need to go to the store) but I need to get the information about the "data usage" (gprs/3g traffic). It is available on the system, but there is no official API call to get that info. One app made it through Apple testing (it's called "Download Meter"), though, and I emailed the guys to see if they would share the call, but they were not in that mood. . . Is there any list of private APIs or anything like that? Does anyone have any ideas of how could I get that info? Again: the app doesn't need to go to the store, but I need to install it on stock iPhone (ad hoc will do). . Thanks.

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