RE: IPv6 day and tunnels

PMTU-d probing, as recently standardizes seems a more likely solution. Having CPE capable of TCP mss adjustment on v6 is another one. Being able to fragment when you want to is another good one as well.

I'll take a) and c), but don't care so much for b). About fragmenting, any tunnel ingress (VPNs included) can do inner fragmentation today independently of all other ingresses and with no changes necessary on the egress. It's just that they need to take precautions to avoid messing up the final destination's reassembly buffers. Fred fred.l.templin@boeing.com