] Host Identity Protocol [3] (HIP) defines a mechanism that
] decouples the transport layer from the internetworking
] layer, and introduces a new Host Identity namespace. When
] a host uses HIP, the transport layer sockets and IPsec
] Security Associations are not bound to IP addresses but
] to Host Identifiers. This document specifies how the
] mapping from Host Identifiers to IP addresses can be
] extended from a static one-to-one mapping into a dynamic
] one-to-many mapping. This enables end-host mobility and
] multi-homing.

Abaddon and I spent some time last summer working on a protocl called Adaptive Addressing Protocol (AAP). It was an attempt to make Mobile IP less silly by allowing hosts to change their IP addresses without dropping connections. It did so by associating connections with a unique identifier, secured by a Diffie Hellman key exchange. Last night, Jeremy points me at this. This is APP, basically. Its amazing how close our designs are. Its also *really* frustrating. We were going to have a working demo this weekend for Phreaknic.

I'm going to read through this stuff and see if there are any design decisions that we made that might be of value to this working group. Having said that, its worth memeing this documentation. This is the right answer for mobile IP and it will probably be the answer we end up with for multihoming of small networks because deploying something like this is less expensive then renumbering the internet geographically.

Host Identity Protocol