Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04

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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