WIndows Updates Fail Via IPv6 - Update!
Mark Andrews
marka at isc.org
Wed Mar 6 04:09:29 UTC 2019
> On 6 Mar 2019, at 1:30 pm, Fernando Gont <fgont at si6networks.com> wrote:
>
> 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).
Which is not a reason to not fix broken equipment and misconfigured firewalls.
The workarounds are basically there because people deploy broken equipment.
Additionally everything isn’t TCP.
> Thanks,
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont at si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>
>
>
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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