RSIP Support for End-to-end IPsec - (IETF RFC 3104) proposes mechanisms that enable Realm Specific IP (RSIP) to handle end-to-end IPsec (IP Security), G. Montenegro, M. Borella, October 2001
Security Architecture for the Internet Protocol - (IETF RFC 2401, Obsoletes RFC 1825, Updated by RFC 3168) specifies the base architecture for IPsec compliant systems, S. Kent, R. Atkinson, November 1998
Security Model with Tunnel-mode IPsec for NAT Domains - (IETF RFC 2709) describes a security model by which tunnel-mode IPsec security can be architected on network address translator (NAT) devices, P. Srisuresh, October 1999