4.10 STABLE: IPv6 PMTU Discovery broken

[Mark Andrews]

> 
> > 
> > > 
> > > 	I was looking at the problem some more.   It appears
> > > 	that the ICMP6 messages are being generated but not
> > > 	emitted.  Both the global and interface counters are
> > > 	increasing.
> > > 
> > > 	"traceroute6 <remote> N"  stops showing the hop
> > > 	when N exceeds 104.
> > > 
> > > 	Mark
> > 
> > 	More digging shows that if you disable ipf (ipf -D)
> > 	"traceroute6 <remote> N" N > 104 now works.
> 
> 	Digging further still the ipf_pullup() for ICMP6 is failing
> 	because m_pullup() is failing.

	pr w/ fix filed kern/70399
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org