Fred, >> Yes, but sending at 1280 does not work for IP tunnels. The whole purpose of >> the minimum MTU was to give space for tunnel headers >> (1500-1280). > > But, if non-tunnel links set a 1280 MTU which is perfectly OK with the > standard then > there is no space for headers. Given the issues with classical PMTUD then > (plus the > non-applicability of RFC4821 for tunnels) the only solution for tunnels is > fragmentation. > I'll let Joe step in if he wants to.
You are correct. "Does not work for IP tunnels without fragmenting the outer header" is what I should have written. Of course it appears IPv6 fragments have a order of magnitude higher drop probability than ICMP PMTUD messages. Pick your poison. Best regards, Ole
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