Negotiation of NAT-Traversal in the IKE. - Tero Kivinen; Brian Swander; Ari Huttunen; Victor Volpe (RFC, 2005)

UDP Encapsulation of IPsec ESP Packets. - Ari Huttunen; Brian Swander; Victor Volpe; Larry DiBurro; Markus Stenberg (RFC, 2005)