North American Network Operators Group|
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Re: MTU path discovery and IPSec
On Thu, 04 Dec 2003 18:03:38 EST, Barney Wolff said: > That's not how PMTUD works. If DF is set, you discard the packet and > report back with ICMP. If DF is not set, you frag the packet - but > that's not PMTUD, because no report ever goes back to the sender. Oh, so we compute ONE number if DF is set, saying what number we think they should use - but if DF *isn't* set, we use a different number. Sounds like more complicated code that's just there so it can sink its teeth into the rump of the first banana-eating NOC dweller that has to figure out what's wrong.... Unless of course there's a *reason* we want it different? Though it escapes me what it might be....