der Mouse <mouse@Rodents.Montreal.QC.CA> writes:

> I'm seeing a problem with path MTU discovery when a NetBSD router is
> in the path. I can't easily check to see if it's been fixed, but
> given how much I seem to push the envelope, I suspect nobody else
> has even noticed.

Reported the same problem to tech-net on Aug 1. No response so far.
Have not had time/priority to pursue it here as a workaround was
available for our setting.

> It seems that packets can be refused for forwarding based on a
> route's MTU, but the returned UNREACH_NEEDFRAG ICMP error takes its
> MTU from the interface's MTU. ...