On 3/3/19 18:04, Mark Andrews wrote: > There are lots of IDIOTS out there that BLOCK ALL ICMP. That blocks PTB > getting > back to the TCP servers. There are also IDIOTS that deploy load balancers > that > DO NOT LOOK INSIDE ICMP messages for redirecting ICMP messages to the correct > back end. There are also IDOITS that rate limit PTB generation to > ridiculously > low rates. One should be able to generate PTB at line rate. > > Everyone that has configured mss-fix-up has contributed to misunderstanding > that > you can block ICMP. It is time we had a flag day to REMOVE mss-fix-up from > all > the boxes you control. We need to get PTB working and unfortunately that > means > that we need to stop pandering to admins who don’t know how IP is supposed to > work. ICMP is NOT optional.
It would seem IETF's intention is to actually move away from ICMPv6-based PMTUD, to the extent that is possible. (RFC4821). Thanks, -- Fernando Gont SI6 Networks e-mail: [email protected] PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
