> Hey, I just realized ... once you start putting connection state onto
> routers, you are basically re-inventing ATM :-)

Heh.  There'ss a slight difference between connection state in the
router which you can't throw away (ATM) and state that's
effectively a cache which you *can* throw away (at some cost)
if the cache breaks.  For example, the ip_flow code that's in -current.

Greg's hack falls somewhere in between, but closer to the latter
I'd say.

I was tempted at this point to join in the discussion, but I've 
deleted those two paragraphs now.  Suffice it to say that
I can live with kludges that live in the end systems
(like PMTU-D itself, and blackhole discovery that it really wants)
but kludges in intermediate systems like Greg's suggestion
really don't belong in generic system code.  I might buy
the idea of someone donating a couple of special hacks to the
internic though 1/2 :-)


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