6.2 mtu now limits size of incomming packet

[Mike Karels]

> Any two hosts, connected to single Layer2 network MUST use
> same MTU. Any other cases lead to hard-to-solve problems.

I'd have to disagree.  In fact, I'd say that any two hosts on the
same L2 network must use the same MRU.  In particular, if a host
choses to use a lower MTU, if that also lowers the MRU, *that* is
the cause of interoperability problems.

David DeSimone <fox at verio.net> wrote:
} You are correct about misconfigured networks.  In my experience,
} the only reason to ever reduce the MTU is to work around a problem
} discovered in someone else's network (not my local segment).  Fixing
} the problem by getting someone else to fix their network is generally
} too hard.  If MTU == MRU was forced behavior, the viability of this
} workaround would be removed, one less tool in the toolbag, so to speak.

Exactly.  In our local labs, we also reduce the MTU to test PMTU discovery.
Requiring MRU == MTU makes this more difficult.  True, it's a contrived
situation, but as you say, one less tool in the toolbag.

		Mike