News

• Ars Technica
• Network World
• SANS Internet Storm Center
• Viruslist.com Analyst's Diary

Cisco Reference

• Certifications
• Cisco Support Wiki
• EOS/EOL Products
• Feature Navigator
• IOS 12.4 Mainline Documentation
• IOS Software Selector
• Network Topology Icons
• Portable Product Sheets
• Product Support
• Solution Reference Network Designs
• What's New in Product Documentation

Networking

• 911networks.com
• Charles Spurgeon's Ethernet Site
  His book is awesome
• Dynamips blog
  By Chris Fillot
• Firewall.cx
• IANA
  Many protocol/number assignments are found here
• IEEE OUI Assignment Search
  Identify the vendor which owns a particular MAC address
• Internet Health Report
• Internetwork Pro Wiki
  Lots of good Cisco info
• Javvin
• Networking Forum
• NIL CT3 Wiki
  A Cisco-oriented wiki started by Ivan Pepelnjak
• OpenPacket.org
  Organized packet capture repository
• Rate My Network Diagram
  It's like hotornot with Visio
• Route Views Project
  List of public looking glasses
• The Packet University
• The Prefix WhoIs Project
  Neat, detailed WHOIS database
• Various Cisco Documents

General Tech

• Ars Technica's OpenForum
• attrition.org
• Cheat Sheets by Dave Child
• Data Center Knowledge
• League of Professional System Administrators
• Open Source Alternative
  A great database of open source alternatives to commercial software
• SANS Reading Room
• UnixWiz.net
  Steve Friedl

Humor

• Cectic
• Ctrl+Alt+Del
• Cyanide & Happiness
• Dilbert
• ExtraLife
• Least I Could Do
• LegoRobot Comics
• Penny Arcade
• Questionable Content
• Real Life
• Saturday Morning Breakfast Cereal
• User Friendly
• VG Cats
• XKCD

Blogs

• 6200networks
  By Joe Harris, CCIE #6200
• A Networker Blog
  By Victor Cappuccio
• Aaron Paxson
• Aaron's Worthless Words
  By Aaron Conaway
• Arden Packeer
• Blindhog
  Excellent video tutorials
• Brandon Carroll
• Bruce Schneier
  Crypto expert
• CCIE Candidate
  By Ethan Banks
• CCIE in 3 Months
• CCIE Journey
  By Carl Yost Jr.
• CCIE Pilot
• CCIE Pursuit
• CertProject
  By Carlito Cubilla
• Cisco Blog
  By Jeremy Cioara
• Cisco Blogs
  Official blogs at cisco.com
• Cisco IOS Hints and Tricks
  Excellent daily tips by Ivan Pepelnjak
• Colin McNamara
• Dancho Danchev's Blog
  Great infosec news
• EDF Network
• Errata Security
• ha.ckers.org
  Web application security
• Kevin Dorrell
• My Etherealmind
  By Greg Ferro
• Richard Bannister
• Route My World
• Tao Security
  Security blog by Richard Bejtlich
• The Ferret's Corner

Linux

• Gentoo Linux
  My distro of choice
• Interactive Linux kernel map
• Linux From Scratch
  Hardcore Linux
• Linux Standard Base

Security

• .aware
• CIRT.net Default Passwords List
• darkc0de.com
• eEye Zero-Day Tracker
• illmob
• Milw0rm
• Open Source Security Testing Methodology Manual
• Packet Storm
• Phenoelit
• Phrack
  ezine
• THC
• Uninformed
  ezine
• Wiretapped

Miscellaneous

• Bookpool
  Great outlet for tech books
• Cisco Resumes
  BradeReese.com
• Internet Maps by Chris Harrison
• Resume writing guide
• Weather in Iraq
  The weather where I am right now