Hi,

opportunistic mode with the help of a rendezvous server could be used for implementing HIP-based anycast. The current RVS specification does not allow this:

http://tools.ietf.org/html/draft-ietf-hip-rfc5204-bis-02

4.3.1. Processing Outgoing I1 Packets

   An initiator SHOULD NOT send an opportunistic I1 with a NULL
   destination HIT to an IP address that is known to be a rendezvous
   server address, unless it wants to establish a HIP association with
   the rendezvous server itself and does not know its HIT.

I think we could specify either a flag in the base exchange or alternatively a special HIT encoding for the "NULL" destination HIT in the I1. What do you think?
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