VPN Standards

The following IETF RFC and Internet drafts describe VPN features:

RFC 1918, Address Allocation for Private Internets
RFC 4364, BGP/MPLS IP Virtual Private Networks (VPNs)
RFC 4684, Constrained Route Distribution for Border Gateway Protocol/MultiProtocol Label Switching (BGP/MPLS) Internet Protocol (IP) Virtual Private Networks (VPNs)

You can access Internet RFCs and drafts on the IETF Web site at http://www.ietf.org.