For more information, see the following resources:
Step-by-Step guide to IPSec at http://www.microsoft.com/windows2000/techinfo/planning/security/ipsecsteps.asp .
IP Security for Windows 2000 Server at http://www.microsoft.com/windows2000/techinfo/howitworks/security/ip_security.asp .
"How To: Use IPSec to Provide Secure Communication Between Two Servers" in the How To section of "Building Secure ASP.NET Applications" on MSDN.
Article 313190, "How To: Use IPSec IP Filter Lists in Windows 2000" in the Microsoft Knowledge Base.
Article 813878, "How to Block Specific Network Protocols and Ports by Using IPSec" in the Microsoft Knowledge Base.
Article 313195, "How To: Use IPSec Monitor in Windows 2000" in the Microsoft Knowledge Base.
IPSec considerations at http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechnol/winxppro/proddocs/sag_IPSECsec_con.asp?frame=true .