Re: [DNSOP] 答复: 答复: Call for Adoption: draft-song-atr-large-resp

Tony Finch <dot@dotat.at> Mon, 28 January 2019 11:32 UTC

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Date: Mon, 28 Jan 2019 11:32:03 +0000
From: Tony Finch <dot@dotat.at>
To: =?UTF-8?Q?Davey_Song=28=E5=AE=8B=E6=9E=97=E5=81=A5=29?= <ljsong@biigroup.cn>
cc: 'Brian Dickson' <brian.peter.dickson@gmail.com>, dnsop@ietf.org, 'Peter van Dijk' <peter.van.dijk@powerdns.com>, 'Ralf Weber' <dns@fl1ger.de>
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Subject: Re: [DNSOP] =?utf-8?b?562U5aSNOiAgIOetlOWkjTogQ2FsbCBmb3IgQWRvcHRp?= =?utf-8?q?on=3A_draft-song-atr-large-resp?=
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Davey Song(宋林健) <ljsong@biigroup.cn> wrote:
>
> >(2) Have you experimented with setting EDNS0 UDP bufsize to the *actual
> >max size* that IPv6 allows *without fragmenting* (or MTU?), and what
> >happens when you do that?
>
> It require resolvers' change to set EDNS0 bufsize below a certain number.

Or for authoritative servers to set their maximum UDP response size
small enough.

Fragmentation in the DNS can be reduced by either the initiator or the
responder without co-operation from the other end. There's a good chance
we can reduce the problem substantially just by changing the defaults and
waiting for people to upgrade, even if there are lots of unmaintained
servers.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
defend the right to speak, write, worship, associate, and vote freely