Re: WIndows Updates Fail Via IPv6 - Update!

[Fernando Gont <fgont () si6networks com>]

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: fgont () si6networks com
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