Articles tagged with tcp

1. Mac OS X TCP Performance Tuning

   Posted on May 05, 2007 in system_administration

   Because Darwin is BSD-based, it's no surprise that Mac OS X TCP Performance Tuning is very similar to FreeBSD TCP Performance Tuning. It is no longer necessary to enable RFC 1323 TCP Extensions (in fact, the option to do so is gone). Also, we'll set the TCP send and receive …

2. Linux TCP Performance Tuning

   Posted on May 04, 2007 in system_administration

   If you have been following our TCP Performance Tuning series, you'll know that we want to enable RFC 1323 Window Scaling and increase the TCP window size 1 MB. To do this, we'll add the following lines to /etc/sysctl.conf and issue sudo sysctl -p to apply the changes …

3. FreeBSD TCP Performance Tuning

   Posted on May 02, 2007 in system_administration

   To enable RFC 1323 Window Scaling and increase the TCP window size to 1 MB on FreeBSD, add the following lines to /etc/sysctl.conf and reboot.

   net.inet.tcp.rfc1323=1  
   kern.ipc.maxsockbuf=16777216  
   net.inet.tcp.sendspace=1048576  
   net.inet.tcp.recvspace=1048576
   

   You can make these …

4. What is TCP Window Scaling?

   Posted on May 01, 2007 in System Administration

   The original TCP specification included a window size no larger than 64 KB. This limitation was introduced by the 16 bit header that specified window size. To achieve the recommended 1 MB window size, RFC 1323 TCP extensions must be enabled. The rest of this post is a somewhat detailed …

5. 14 Algorithms For TCP Congestion Control

   Posted on April 29, 2007 in system_administration

   Note: Although this is a continuation of the TCP Performance Tuning article series, it's also valuable as a standalone reference.

   This is a list of 14 congestion control algorithms available in TCP. I'm presenting it in alphabetical order.

   1. BIC TCP - Binary Increase Congestion Control, this is the default congestion control …

6. TCP Performance Tuning

   Posted on April 28, 2007 in system_administration

   Note: Stanislav Shalunov wrote an excellent article on TCP over WAN Performance Tuning and Troubleshooting. In this series of articles, I want to summarize his findings and provide tuning suggestions for popular operating systems.

   Most operating systems today ship with TCP stacks optimized for either LAN (high speed, low latency …

7. Choosing Between RADIUS And TACACS+

   Posted on April 24, 2007 in Networking

   Deciding whether to use <acronym title="Remote Authentication Dial-In User Service">RADIUS</acronym> or <acronym title="Terminal Access Controller Access Control System Plus">TACACS+</acronym> for <acronym title="Authentication, Authorization, Accounting">AAA</acronym> functionality on a Cisco-based network seems straight-forward. After all, if the network uses Cisco, shouldn't the AAA …