Is there a python library which implements a standalone TCP stack? I can't use the usual python socket library because I'm receiving a stream of packets over a socket (they are being tunneled to me over this socket). When I receive a TCP SYN packet addressed to a particular port, I'd like to accept the connection (send a syn-ack) and t...
I have just started writing socket programs. Came to know that single UDP packet has source port destination port and some MAC address representing router..etc. I wonder why anybody cannot create custom packets with a fake information in and send it over internet. I would like to know how safe are our PCs. What should be done to secure i...
So, for a CS project I'm supposed to sniff a network stream and build files from that stream. For example, if the program is pointed to ~/dumps/tmp/ then the directory structure would be this: ~/dumps/tmp /192.168.0.1/ page1.html page2.html [various resources for pages1 & 2] downloaded file1 /192.168.0...
Hello, I have to send mesh data via TCP from one computer to another... These meshes can be rather large. I'm having a tough time thinking about what the best way to send them over TCP will be as I don't know much about network programming. Here is my basic class structure that I need to fit into buffers to be sent via TCP: class Pr...
I'm writing a socket server and flash game client. The game requires real-time commands such as movement and turning. It is important for these commands to be sent by the server to the client as soon as possible because the other clients will otherwise desynchronise a lot with the moving/turning client. This is an example of the problem...
I have a very simple Winsock2 TCP client - full listing below - which simply blasts a bunch of bytes. However, it's running very slowly over the network; the data just trickles by. Here's what I've tried and found (both Windows PCs are on the same LAN): Running this app from one machine to the other is slow - it takes ~50s to send 8MB...
I have an application that receives relatively sparse traffic over TCP with no application-level responses. I believe the TCP stack is sending delayed ACKs (based on glancing at a network packet capture). What is the recommended way to disable delayed-ACK in the network stack for a single socket? I've looked at TCP_QUICKACK, but it se...
I have configured /etc/apache2/apache2.conf with Timeout 5 instead of the default 300. So I understand it should close an incoming connection after 5 seconds of inactivity. But I make a telnet localhost 80 , wait for 5 and more seconds, and nothing happens. A netstat -na tells me the connection is still ESTABLISHED. I left the connectio...
Hi, I am using socket to send data from local machine to remote in TCP, stream mode. The code in the local side is : // ----------- Local send(sd, pData, iSize, 0); // send data The size of the data is about 1Mb, so socket might divide it to several packets. While I am recieving the data on remote side, I have to recieve the data se...
If i send 1000 bytes in TCP, does it guarantee that the receiver will get the entire 1000 bytes "togther"? or perhaps he will first only get 500 bytes, and later he'll receive the other bytes? EDIT: the question comes from the application's point of view. If the 1000 bytes are reassembles into a single buffer before they reach the appli...
Hi, I've been having this issue for a while now and was never really able to resolve it. This issue only appears when I'm using the SendAsync/ReceiveAsync methods rather than the Begin/EndSend socket methods for asynchronous operations. If have a fairly sophisticated tcp socket library and been meaning to replace the BeginSend methods ...
I have a .NET 3.5 C# application that sends 2000-6000 byte packets to a linux machine running sles 10. The machines are on the same subnet. About 90% of the time, everything works fine. The linux machine processes my request and responds in 5-15ms. But about 10% of the time, there is an approx 200ms-800ms delay. Looking at the logs ...
is it possible to determine whether google talk uses tcp or udp packets for transmission. i know it uses the xmpp protocol at the application layer, but does it run over tcp or udp. ...
HELP PLEASE! I have an application that needs as close to real-time processing as possible and I keep running into this unusual delay issue with both TCP and UDP. The delay occurs like clockwork and it is always the same length of time (mostly 15 to 16 ms). It occurs when transmitting to any machine (eve local) and on any network (we hav...
I have .Net service that listens on single port over TCP protocol. Clients connect and then transmit data for some time (from few minutes to several hours). Is there any limit on number of connections on Windows 2008 server? I did not hit any, since now there is up to 50 users. Plan is to have thousands of users, so I'd like to know if...
I am getting confused between TCP being Connection oriented and UDP being connectionless so please somebody clarify this. Every communication between two computers whether its TCP or UDP is via packets. There is no hard wire connection between two peers whether its TCP or UDP. Then why TCP is said to be connection oriented just because...
How efficient is it to use sockets when doing IPC as compared to named pipes and other methods on Windows and Linux? Right now, I have 4 separate apps on 4 separate boxes that need to communicate. Two are .NET 3.5 applications running on Windows Server 2003 R2. Two are Linux (Suse Linux 10). They're not generally CPU bound. The amou...
How can I find the version of TCP running on my MacOsX? ...
I would like to close an existing connection between to application running on my server. If you have a suggestion please reply on how to program this, you will be appreciated. Note that: TCPView application can close the connection exactly as I need, but I would like to run it as a console application or other command line. ...
I have this strangest problem and I can't debug it. I am writing a heavy JavaScript application, which spawns a popup when user uploads a file. The actual file transfer happens in the popup, which is set to be the FORM submit target. Works in all browsers, there are no javascript errors. However, in Google's Chrome browser, when form i...