[dns-operations] [Ext] DNS Flag Day 2020 will become effective on 2020-10-01

[Mark Andrews]

On 17 Sep 2020, at 02:38, Paul Vixie <paul at redbarn.org> wrote:
> 
> On Wed, Sep 16, 2020 at 09:24:05AM -0700, Randy Bush wrote:
>>> We should admit that actual Internet MTU is ~1500
>> 
>> sad but true
>> 
>>> PMTUD ... doesn?t work
>> 
>> sad but true
> 
> happily, that's not known about PLPMTUD (RFC 8899 & 8900). so right now
> there's new hope, yet undashed. i would like to saturate a modern LAN and
> future WAN with O(10^7) physical-layer packets, which will mean that those
> packets will have to be up to O(10^6) octets in size. this can't happen
> under the tyranny of 1500, nor of 1280 or 1232.

But DNS traffic doesn’t need those sized packets even for zone transfers.

> -- 
> Paul Vixie
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org