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Whither a session layer, and where (was Re: Consensus on identifier/locatorsplit?)

Iljitsch van Beijnum wrote:
A much more useful approach would be to run the session layer _underneath_ the transport layer so the transport protocol can do its magic and the session layer can juggle the addresses.
I concur.

The interface between such a session layer and the transport layer
seems to become very interesting.  For example, which layer is going
to keep track of MTU and RTT?  How to do traffic shaping between
several transport connections going over a single endpoint-to-endpoint
"session"?  Etc.

--Pekka Nikander