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Questions tagged [tcp]

TCP stands for Transmission Control Protocol and is one of the core protocols of the Internet Protocol Suite. TCP complements the Internet Protocol (IP), and therefore the entire suite is commonly referred to as TCP/IP.

TCP is just one communications protocol on the web. Others include:

  • User Datagram Protocol (UDP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • Post Office Protocol (POP3)
  • File Transfer Protocol (FTP)
  • Internet Message Access Protocol (IMAP)

TCP on Wikipedia

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How to use tshark to do this task

I don't have any base knowledge about tshark, and it is hard to find any tutorial to help me with this. So now I have a pcap file which consists a lot of network flows; a time range; an ip addr; a tcp port number; the number of packets sent by the…
Tor
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Maintaining same TCP session, load balacing

With http live streaming (HLS) we need to deliver video segments one after other to the player to play them in a continuous fashion. Segments are present on many streaming servers and we would load balance between these servers to deliver segment.…
Nagota
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Forward non HTTP traffic on port 80

I'm creating an Android application that uses MQTT protocol to send real time messages, however the local firewall is strict and blocks most ports so the android app can not connect. (Server is outside of the firewall, but users at my location…
Evan Elliott
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Detecting TCP/IP connection drop issues in my application

I have a desktop application which talks to a server using TCP/IP. It was working before but now we are running into an issue. The log message on the server shows that the socket is disconnected after a while, but we are able to exchange heartbeat…
Jeeva
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tcp fusion on Linux?

Is there any equivalent of Solaris' TCP fusion (for loopback connections) on Linux ? would it exist as part of a distro or a specific module ? (the background for the question is the will to achieve the lowest latency loopback TCP communication…
Bastien
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Windows Server 2008 not accepting connections to Server Programs

A company which our agency works for got a Windows Server 2008. I've had the job to install an FTP-Server (FileZilla Server) on this Windows Server 2008. Now my problem is that the server does not accept most of the connections. VPN-Connections to…
trampi
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sysctl setting for maximum connections from ip address

Is there any settings in sysctl that controls the maximum number of connections that are allowed from any one ip address? I'm having connection issues a redis server and a rabbitmq instance and I'd like to eliminate this possible condition before…
Will Olbrys
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What to check when nginx is fast to serve requests once connected, but slow to connect?

There is sometimes a 1-2 second delay when connecting to port 80 (nginx) over the public interface. It occurs 50% of the time. Once connected nginx serves all requests, including fastcgi proxy requests, lightning fast. I have confirmed it is not a…
doodler
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Server Dropping all Connections Randomly and Packet Loss

I just built a server using a Supermicro X8DAH+-F board and running Ubuntu 10.04 Server 64bit. This has the Intel 82576 dual port controller (one port is disabled). Since this is a server, remote access is imperative. The server is connected to a…
Ryan Rosario
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How do I determine if a certain port is being blocked?

I've wrote a .NET WCF service I put onto a Windows Server 2003 R2 server several months ago. I've not been able to work with it since, due to other job related responsbilities, but now am trying to get back to it. Back when I did work on it, it…
Rod
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how to enable port 7777

I am initiating file transfer using tcp on openfire server. But I am not able to open the port number 7777, from which I need to send files. I changed the security setting in the admin console panel of the aws. But still when I tried to send the…
Jeevan Dongre
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tcptraceroute showing paths of greatly varying length

I'm tracing a path to my server using tcptraceroute. The server is showing intermittent network availability. It's as if some packets get through fine, others take a long time and some never get there. Here are two tcptraceroute's to the server. Any…
kobrien
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Finding the so_sndbuf of a running process

I'm wondering if there's any way to find the tcp so_sndbuf of an actively running process (such as apache or nginx). I know that tcp_wmem sets the default value, but I'm not sure if the server programs I'm working with set their own. My purpose for…
Mediocre Gopher
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Cisco 837 not passing UDP traffic properly (was: DNS query problem)

We have a setup of ADSL line -> Cisco 837 ADSL router -> Zyxel ZyWall 35 firewall/NAT -> Switch -> LAN. It has been fine for years, suddenly DNS resolution stopped working from the LAN to public DNS servers. No changes that I know of, so I can't…
TessellatingHeckler
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Is a low-bandwidth arp-scan potentially disruptive to persistent TCP connections on the same LAN?

First a little background: On the (isolated) /16 LAN in question, we have several devices that keep several persistent TCP connections open between them. The program at each end of these TCP connections sends a "heartbeat" packet to its partner…
Jeremy Friesner
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