- Using IPSec in Windows 2000 and XP (very good, in-depth details)
- Using a Microsoft Windows 2000 Client to Connect to the Cisco VPN 3000 Concentrator (with certificates)
- The Trouble With Multivendor IPSec (workshop/interoperability trial description)
- The Microsoft L2TP/IPSec Client
- FreeS/WAN + X.509 patches and Windows XP
- Windows 2000 / Windows XP - Freeswan VPN
- Article on Windows Advantage (biased, but with several scenarios)
Tools
- Microsoft L2TP/IPSec Client (for pre-2000 OSes)
- VaporSec (front-end for Mac OS X)
RFCs:
- IETF Charter
- RFC 2401 - Security Architecture for the Internet Protocol
- RFC 2402 - IP Authentication Header
- RFC 2406 – IP Encapsulating Security Protocol
- RFC 2408 – Internet Security Association and Key Management Protocol (ISAKMP)
- RFC 2409 – The Internet Key Exchange (IKE)