Regarding HIP + map/encaps, maybe it is obvious to everyone else
already but I think what that gives you is an endpoint identity
(the HIT), an inner routing locator (iRLOC), and an outer RLOC
(oRLOC). Up to now, LISP (and perhaps others) have been using the
term "EID" to refer to what I mean by "iRLOC", and the term "RLOC"
to refer to what I mean by "oRLOC".
That is my basic model as well. Further, as Brian observed, that
can be applied recursively.
Yes. One small but important distinction though is that recursion is
not meaning to say that there would be recursive encapsulations
(i.e., IP0-in-IP1-in-IP2-in ... in-IPN); else we would eat ourselves
out of MTU in a hurry.
I agree.
Rather, we can talk about recursive RE-encapsulations. So, the
initial encapsulation would be: HIT-in-iRLOC-in-oRLOC0. The packet
would be forwarded within the scope within which oRLOC0 is routable,
then decapsulated and re-encapsulated as HIT-in-iRLOC-in-oRLOC1.
Well, I would expect 1-to-1 mapping between HITs and iRLOCs, allowing
one to use just one encapsulation or even almost-null encapsulation.
That is, e.g. iRLOC-in-oRLOCi, HIT-in-oRLOCi, or TAG-in-oRLOCi where
TAG is whatever minimal encapsulation/tag is needed for demuxing at
oRLOCi.
It is exactly analogous to the way the L2 destination is changed on
each IP forwarding hop without the L3 destination address changing.
The only difference is that the outer IP protocol is seen as L2 by
the inner IP protocol.
I think that has been discussed more extensively in the following
papers and drafts. But I didn't check, I may be wrong.
Jukka Ylitalo, Patrik Salmela, and Hannes Tschofenig, "SPINAT:
Integrating IPsec into Overlay Routing", in Proc. of the First
International Conference on Security and Privacy for Emerging Areas in
Communication Networks (SecureComm'05), pp. 315-326, Athens, Greece,
September 5-9, 2005, ISBN 0-7695-2369-2
http://www.ietf.org/internet-drafts/draft-melen-spinat-01.txt
A. Eriksson and B. Ohlman, "Dynamic Internetworking Based on Late
Locator Construction," IEEE Global Internet Symposium, 2007.
--Pekka
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