>>> Bugs have to be fixed, not worked around by disabling a feature.
>> I agree.  But then why do we support MSS clamping?
> Because we cannot make Verizon stop using pppoe :-)

PPPoE is not the problem either; it merely is the commonest cause of
setups which expose the problem.  Making Verizon stop using PPPoE would
just be another workaround.

The real problem is on the other end: hosts which try to do PMTU-D, but
are behind boxes (usually misconfigured firewalls) which drop the ICMPs
necessary for PMTU-D to function.

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