[Hipsec] rendezvous section of hip-arch

[[e-mail] (Lars Eggert)]

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Hi,

as explained during my RG slot yesterday, I'd like the group to consider 
changing the hip-arch ID to remove discussion of the specifics of 
rendezvous mechanisms.

I'll go over this in the WG slot as well, but the basic reason is that 
the current text in the hip-arch ID states some specifics about the 
behavior of rendezvous mechanisms that may paint us into a corner. 
Having this text in the hip-arch ID when it goes to RFC may complicate 
the RG's and WG's work into the details of rendezvous mechanisms.

Here's some proposed changes to the only three parts of 
draft-moskowitz-hip-arch-05.txt that talk about rendezvous. They 
essentially remove these specifics:

(1) Change section 5.1 to:

5.1 Rendezvous mechanism

    Making a contact to a mobile node is slightly more involved.  In
    order to start the HIP exchange, the initiator node has to know how
    to reach the mobile node.  Although Dynamic DNS could be used for
    this function for infrequently moving nodes, an alternative to using
    DNS in this fashion is to use a piece of new static infrastructure
    to facilitate a rendezvous between HIP nodes.

    A rendezvous mechanism is also needed if both of the nodes are mobile
    and happen to move at the same time.  In that case, the HIP readdress
    packets will cross each other in the network and never reach the peer
    node.

    A separate document will specify the details of the HIP rendezvous
    mechanism.

(2) Remove the last paragraph of section 9 (just before 9.1). I'm not 
too worried about what it says about rendezvous servers, but it doesn't 
seem to follow out of the preceding paragraph, and it doesn't lead into 
the following section. Don't know the edit history of the ID in detail; 
maybe it is left over from a previous round of edits? It currently reads:

    Since all systems can have a Host Identity, every system can have an
    entry in the DNS.  The mobility features in HIP make it attractive to
    trusted 3rd parties to offer rendezvous servers.

(3) Change item 6 of section 9.1 to:

    6.  What administrative infrastructure is needed to support it?

           It is possible to use HIP opportunistically, without any
           infrastructure.  However, to gain full benefit from HIP, the
           HIs must be stored in the DNS or a PKI, and a new
           rendezvous mechanism is needed.

Comments?

Lars
-- 
Lars Eggert                                     NEC Network Laboratories

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