cheat sheets for different languages

http://www.cheat-sheets.org/#Perl

VOIP Testing tools

http://hubpages.com/hub/10-Open-Source-VoIP-test-tools

Ebook blog

http://feboook.blogspot.com

Olive setup for JunOS

http://brokenpipes.blogspot.com/2008/01/olive-is-alive.html

orion network Monitor

Good tools for network performance / traffic analysis

http://www.solarwinds.com/downloads/

Dynamips/Dynagen Tutorial

All info required for dynamips/dynagen used by GSN3. Look specially for "idle pc" value calculation

http://dynagen.org/tutorial.htm#_Toc193248012

How to add vmware system to GSN3

http://www.gns3.net/phpBB/topic1139.html?sid=1131becfebf5b25c4e67ef809f4f1d24