http://www.rfc-editor.org/rfc/rfc5204.txt
RFC 5204: Host Identity Protocol (HIP) Rendezvous Extension, J. Laganier, L. Eggert2008-04-01T23:00:00-00:00This document defines a rendezvous extension for the Host Identity Protocol (HIP). The rendezvous extension extends HIP and the HIP registration extension for initiating communication between HIP nodes via HIP rendezvous servers. Rendezvous servers improve reachability and operation when HIP nodes are multi-homed or mobile. This memo defines an Experimental Protocol for the Internet community.