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.

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Need help troubleshooting intermittant TCP timeout in HAProxy

I have an application where the client connects to a server via a simple TCP based protocol over TLS/SSL. In development, this has worked great for many months while we were building our application ...
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239 views

How can one redirect to a new host all traffic destined for an old host?

We're moving a bunch of services, say from 1.2.3.4 to 5.6.7.8. In order to test that the new services are correctly configured, we'd like to redirect (to the new host) all traffic destined for the ...
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515 views

Max client TCP connections through a router

I've just been thinking about what the maximum number of client connections would be out of my home LAN to a single server on the internet. My home router is also NAT'ing the connections to convert ...
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Windows Server 2008 - unable to bind any TCP port

OS: Win Server 2008 RC2 Windows firewall on (no effect when off) I have suddenly been plagued by an issue in which I cannot find any similar ones with a search. I am running about 20 game servers ...
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72 views

how to use tcpdump to log only certain data in real time

I'd like to monitor network interfaces but only log things likes errors, collisions and dropped packets. The send that to stdout. – Can tcpdump be configured to do this?
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161 views

TCP application accessible remotely but not locally

I am trying to help a friend figure this out, so I don't know all the details, but I figured I would post on here to see any possibilities. We have a custom application that communicates using a ...
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2answers
161 views

Can't access server use domain name, got tcp flag RST

I have a http sever provide service to internet, so I configured port forward in router. It’s fine for users access server outside company (URL: _http://mydomain.com:80/). But if the user is inside ...
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2answers
514 views

Solaris: Increase TCP's Initial Congestion Window to 10 segments (tcp slow-start)

How can the Initial Congestion Window be increased to 10? It seems it can be done with TCP_INIT_CWND, but I don't know how to do that.
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TCP hang up in interactive sessions

I am experiencing a problem on the intranet of my institution. I am sitting in front of A and trying to connect to server B in another city. My ssh sessions hang up quite often, especially when I ...
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175 views

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 ...
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181 views

tcp ack delay almost 600ms, is this all right?

As far as I konw, tcp delay ack always 200ms, but now in my production environment it delay almost 600ms, my environment is below: ubuntu 11.04 48G memory 16 core, load not heavy; I catch packet in ...
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53 views

Distributed LAMP vs DB and Web Server same box

We have a very read heavy semantic web (RDF) application which is RHEL 5/Apache 2.2.3/Tomcat 6/Java 6 on one Server, and MySQL 5.1 on another. Apache and MySQL are backported Red Hat repo stuff, so ...
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309 views

MySQL connection errors when client server bandwidth is exhausted

I have several servers with a lot of outgoing traffic using nginx. When the bandwidth is exhausted (1Gbit), I have problems connecting to my mysql server from those servers. The connect always fails ...
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2answers
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TCP port numbers reused and TCP Retransmission

Facing issues due to TCP Port Reuse and Retransmission for HTTP traffic. My deployment is as follows: enter image description here I have a squid proxy installed on a unix machine which is sending ...
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2answers
107 views

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 ...
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2answers
98 views

Impact of Traffic through the first NIC on the second NIC

I have two NICs on a RHEL 6 server. They are both set at 1GB/sec full duplex. The first NIC has lots of small (< 100 byte) TCP socket writes. The second NIC is used to receive a 50 MB/sec TCP input ...
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356 views

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 ...
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1answer
867 views

How to enable/disable TCP DELAYED ACK parameter on SUSE linux?

I want to disable TCP DELAYED ACK parameter on SUSE Linux Enterprise Server for some performance tuning operations. I have used sysctl command but it does not list this parameter. also in SUSE ...
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1answer
271 views

iptables NAT Forward 443 Port DNAT,SNAT failing

I'm trying to setup a proxy server that handles http and forwards https to the webserver. Client > Proxy > httpd I added the rules: iptables -t nat -I PREROUTING -i eth1 -p tcp -m tcp --dport ...
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1answer
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How to enable jumbo frame and large TCP on Windows Server 2008

I needed to enable the jumbo frame 9000 in network setting, and I have already done that. I still need to enable large TCP on Windows Server 2008, but how do I do that?
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1answer
74 views

IIS listening 127.0.0.1 instead 0.0.0.0

I configure binding on my IIS 7 server like: ip address: All Unassigned port: 8080 but in netstat -aon command see only 127.0.0.1:8080 instead 0.0.0.0:8080(which I would like) (0.0.0.0:8080 is ...
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1answer
691 views

how to open tcp port in ubuntu

I have a ubuntu server How can i open a port ? I have flushed the iptables and off'ed ufw Provide me steps how to open a tcp port