Virtual PC

Here is a good tool to simulate virtual PC's for GNS3/ Dynamips.

http://wiki.freecode.com.cn/doku.php?id=wiki:vpcs

Blog - Jeff Doyle

Jeff Doyle's blog -

http://www.networkworld.com/community/blog/2404

Blog on varied networking topics

Here is a blog on varied networking topics -

http://networkers-online.com/blog/

IPSEC messaging

The following link details IKE Phase 1 and 2 messaging.

http://www.tech-invite.com/Security/Ti-IPSec-exchanges.pdf

BGP Best Practices

Here are some good links related to BGP best practices (straight from google)-

http://www.apnic.net/meetings/22/docs/tut-routing-pres-bgp-bcp.pdf

http://www.team-cymru.org/ReadingRoom/Templates/

http://www.ripe.net/meetings/regional/manama-2006/presentations/BGP-BCP.pdf

http://ws.edu.isoc.org/workshops/2005/SANOG-VI/routing/materials/b2-6up.pdf

http://www.first.org/resources/guides/

Scapy packet crafting tool

Just getting started with Scapy. Trying to compare scapy and hping2/3.

Scapy: http://www.secdev.org/projects/scapy/

OSPF SPF details

Found a very good link related to OSPF SPF Algorithm with an example.

http://routingfreak.wordpress.com/2008/03/06/shortest-path-first-algorithm-demystified/