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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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reset packet sent when receiving big TCP traffic

A client receives chunks of TCP segments from a server, which total 20MB or more. Sometimes the client will send RST segments to the server before terminating the TCP connection. Before sending RST segments, I did not find any segments indicating…
Max Fan
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IP and Port Forwarding on ASA 5505

I have an ASA 5505 with outside network of public ips 95.123.234.64/26 and inside network of private ips 10.22.33.0/24. I would like to redirect any tcp traffic that hits 95.123.234.67:80 to a public ip 78.123.234.56:22. I don't know if it's…
James
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Which bit represents which TCP flag?

For instance, a WireShark capture filter example I found - tcp[13] & 8 == 8 represents packets with PSH flags. How do I count the 8 ? Based on the wikipedia image, PSH is in the middle of the TCP flags segment. Counting 1 from the NS flag, PSH…
iridescent
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Effects of IW10 (initcwnd 10 initrwnd 10) on high speed LAN based TCP/IP communications?

What does changing the number of packets sent during the initial congestion window to 10 have on LAN connections? Via: ip route change default via GATEWAY dev INTERFACE initcwnd 10 initrwnd 10 Is this advisable / inadvisable for high speed (1gbit)…
anonymous-one
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Secure TCP based protocol through an application layer firewall

I have two networks, one considered secure, lets call it A and one considered insecure, B. The software I need to use, uses HSMS, a protocol based on TCP with no security built in. Now the problem is that the software has a server a in the secure…
dignifiedquire
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Simulating many client connection to server

I've written a protocol on top of TCP using C# Sockets class which allows the transfer of files between many clients, and put it on a Windows Server 2008 VPS. I have then written the client-side stress-test which simulates several clients connecting…
Daniel
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How to test the max. number of connections of a given TCP port

We are using a server (closed sourced) written by a vendor that claims it supports up to a maximum of 100 concurrent TCP connections. We want to test this claim. We can certainly write a script to automate it, but before that, are there any handy…
Ryan
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limit connexions to my proxy

I have a slow internet bandwith (1024 KBITS/S) to share between 30 users. To control the traffic, I have setup a basic proxy server with iptables. Logs and Packets captured with tcpdump show that there are a lot of connections per IP. So I want to…
user158124
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Can Windows 2008 send proper TCP termination once a process has been killed?

Meet "S" and "P" two server side apps connected via some TCP socket, both running on Windows 2008. In fact, S connects to P using port 20202 At some point over the week end, P is killed without notice, which S finds with a connection reset. S enters…
user156376
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Routing config between internet load balancers and backend

Im facing a problem due my lack of experiencie on routing. I need to config the next things (all run on my computer virtualized, if works, i will pass it to hardware) [internet] ----…
PsySkeletor
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why 5 rx queues per NIC

On my office server, the output of cat /proc/interrupts displays one tx queue and 5 rx queues. Is this due to NIC hardware capabilities or can you configure multiple receive ring buffers in linux per NIC? Also wouldnt 5 rx queues, increase latency…
Jimm
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TCP: Redundant checksum avoidance specification

TCP provides a mechanism to change the checksum scheme used by the two parties in a TCP session. There are four allowed checksum schemes according to this table, the last being "Redundant Checksum Avoidance". As far as I understand from this Q&A,…
Randomblue
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Port scanning from localhost

I see lot of tcp connections on different ports on my server with 'TIME_WAIT' status. Just simple port scan, but i cant see ip address of this bastard because connections is going from my nginx. Can you please give me a tip how can i see IP address…
Jaels
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How to enable TCP/IPV4 disabled on LAN via command prompt

I have unchecked tcp/ipv4 protocol from LAN properties & now iam unable to access the server or connect remotely. However i have serial console access to the server where i can use netsh command. Kindly advise as i am stuck since 3 days & also i…
user139626
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What can impact the throughput rate at tcp or Os level?

I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower…
Jimm
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