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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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FC14 available TCP ports?

I am installing an application on Fedora Core 14 that uses a lot of sockets (eight of them) for TCP communication between various servers, all running on the same localhost. I've been trying to find some info on what ports are generally open on…
Steve
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TCP Sweep , Security warning ?

I've just recevie an email from my hosting company : " Hello from AT&T Hosting and Applications Services. I am a Security Engineer here trying to track down a security incident that appears to have originated from your network on May 03, 2011. …
raul lazar
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Windows TcpNumConnections registry key

I hope this question isn't out of place here, but can anyone explain to me what the 'TcpNumConnections' registry key does? The description has me confused; I'm not sure what Microsoft means by 'connection' in 'Specifies the maximum number of…
zsuper
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Cannot login to Cisco 2911 over ssh?

30 minutes ago my router is not accepting ssh connection. Well, ports is open (due to nmap), ssh simply hangs on reading from Cisco socket (observation from strace): /home/rafal/.ssh/id_dsa-cert type -1 ) = 60 open("/etc/passwd", O_RDONLY|O_CLOEXEC)…
bluszcz
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How to set dscp for incoming TCP connections to my server?

I need to specify dscp settings for the incoming TCP connections to my server. What is the easiest way to do that?
Lars D
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Is it possible to load balance requests from a single source?

In our application, Server A establishes a TCP connection with Server B, then it sends a large amount of requests to Server B over the TCP connection. The request message is XML-based. Server B needs to respond within a very short period, and it…
Shawn
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Simulate a bad TCP connection with iptables?

I want to forward TCP connections on a certain port of the machine A to another port on the machine B (which is actually the same that originated the connection to machine A) and simulate random or deterministic packet drops. How can I do it with…
Alex B
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Computer Networks Question

Consider the effect of using slow start on a line with a 10-msec round-trip time and no congestion. Assume the maximum segment size is 4KB and the threshold is set to 16KB initially in congestion control algorithm. How long does it take before a…
Nick
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Strange TCP connection

Machine is RHEL 5.3 (kernel 2.6.18). Some times I notice in netstat that my application has connection, when Local Address and Foreign Address are same. How it's possible? Update 1 I catch it on netstat: tcp 0 0 127.0.0.1:50003 …
dimba
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tcp payload size is it one byte?

Well the tcp segment number is used to identify a byte in the byte stream. So does tcp only support a payload of size one byte only ?
user68350
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sliding window protocol?

I understand how sliding window protocol makes the network reliable. But how can it control the flow of data?
user68350
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tcp acknowledgement how it happens

Receiver is A , and sender is B The receiver sets the window size to 1000, and B sends segments. Assume that segment 500 to 521 is lost. Then receiver A would send an ack of 501 to the sender. Once the sender receives the ack of 501 it will then…
user68350
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TCP stream injection on unencrypted wireless

I may be misunderstanding something, but wouldn't TCP stream injection be terribly easy on an unencrypted LAN? My University's campus-wide WiFi is unencrypted (bad, I know) and all I have to do is bring up Wireshark and I can see a crapload of TCP…
Caleb Hearon
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How do I find which process is dropping my TCP ACKs on a dual-homed machine?

I have a dual-homed machine (1 LAN, 1 DMZ) using static IPs on both, with routes configured so that packets coming in on the LAN IP use a LAN gateway and DMZ packets use a DMZ gateway. I am using tcpdump for debugging on the local machine. When…
HikeOnPast
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What is a RP Paket in a tcpdump log?

I have a tcpdump log with the following entry: 14:53:31.428570 IP 10.4.65.65.16666 > 192.168.201.10.80: RP 587:687(100) ack 48545454154 win 0 My Problem is that i have never seen an RP paket before.. What does it mean? Is it kind of a reset…
Fake4d
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