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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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Can a network interface be configured to have a default gateway for UDP packets?

It is quite possible that my question may not make a lot of sense. I apologize, but I am not a networking guy, and that's my excuse. To elaborate, WikiPedia defines "Default Gateway" as a node on a "TCP/IP" network. And the way it works is that if a…
Vaibhav
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Re-writing/re-routing TCP packets for load balancing

I have several Windows Media servers I wish to load balance and I am wondering if I can use a load balancing server to very efficiently rewrite or re-route data packets. I know that load balancing is relatively simple to achieve by using a software…
MSR
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No transmission via IP

I'm using netstat on Win XP to check protocol transmission details for TCP, IP, and ICMP. There is transmission only in TCP. No transmission in ICMP is understandable since it's for errors and I assume that there were none, but why is there no…
Richard
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Make bridge table with UDP packet

Assume that all bridge table was empty (or at least don't have source and destination of my connection ) and want to update their bridge table with my sending packet (when I send packet all bridge understand where "Sender Host" are and when…
Amirreza
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Tuning TCP sysctl on centos

I have website that gets higher tcp timeouts at peak times and slows down bit, here are few stat graphs sysctl config atm: net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq =…
Nick
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Strange 2Mbps limit for single tcp connection on 24Mbps ADSL2+

I've D-Link DSL-2500U/BRU/D, ADSL mode is "ADSL2+ AnnexM EU-56", configured as bridge and connected to linux (Gentoo) workstation. Line is good enough, I've stable speed 2.09MiB/sec (i.e. about 18-20Mbps)... but I can see this speed only while…
Powerman
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Why proxy servers can access to my server while I can not?

So I have a server. Its up and running. It is accessible by Proxy servers. Problem is - server is accessible out of local network by its global name and not accessible inside by that name... I used windows NAT Traversal api (UPnP) to make my server…
Blender
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Detect and aggregate packets sent to server per TCP port

Is there a way with Ubuntu 10.4LTS to detect and aggregate the number of packets transmitted over every port? In other words, I'd like a process to keep track of the number of packets sent to each TCP port (whether or not a connection is…
Brian M. Hunt
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TCP 3 way handshake

i'm just observing what NMAP is doing for the 3 ports it reports are open. I understand what a half-scan attack is, but what's happening doesnt make sense. NMAP is reporting ports 139 are 445 are open..... all fine. But when i look at the control…
Tom
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Sharepoint Ports

I am installing Sharepoint 2007 and I want users to be able to sign into it from outside. I need to know what ports do I need to open and do I need UDP or TCP or both?
Jack Levin
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What port does OpenLink ODBC Driver use?

I use Avaya Reporting Services and OpenLink ODBC Drivers for db connection. I know that it uses port 5000 for handshaking but after that I believe it uses an random port for communication. I want to deploy my application and it will communicate with…
None
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How to enable TCP Vegas on Centos 5.4?

I'm trying to enable TCP Vegas congestion control on Centos 5.4 box. According to Vegas home page it is as simple as echo 1 > /proc/sys/net/ipv4/tcp_vegas_cong_avoid but this file does not exist. I found kernel module…
jackhab
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Understanding TCP RST Network Capture

I only really need help understand the following image, but I will give the background for context. We have an app that is configured to use a proxy on port 8080 and requires Internet access. At random times throughout the day, the app fails to…
Mucker
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Automatic TCP SYN - cookie activation

I am simulating a SYN flood attack on a Raspberry Pi 1 with KALI Linux (ARM) installed. A similar message as mentioned in this post was printed after performing the attack: How to avoid syn cookies. kernel: possible SYN flooding on port X. Sending…
Gerry
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TCP session refused immediately after accepting it

Host_A tries to send some data to Host_B over TCP. Host_B is listening on port 4712. Host_A is a remote PC connected on a dedicated WAN. Host_B is a local embedded device based on embOS OS, connected to the WAN throuth a pair of redundant (HSRP)…
robocat
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