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Re: [BEHAVE] [DNSOP] [v6ops] New Version Notification for draft-momoka-v6ops-ipv6-only-resolver-00.txt

Geoff Huston <gih@apnic.net> Mon, 17 October 2022 00:27 UTC

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From: Geoff Huston <gih@apnic.net>
To: Michael Richardson <mcr+ietf@sandelman.ca>
CC: Joe Abley <jabley@hopcount.ca>, dnsop <dnsop@ietf.org>, 6man list <ipv6@ietf.org>, "behave@ietf.org" <behave@ietf.org>, v6ops list <v6ops@ietf.org>
Thread-Topic: [DNSOP] [BEHAVE] [v6ops] New Version Notification for draft-momoka-v6ops-ipv6-only-resolver-00.txt
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Date: Mon, 17 Oct 2022 00:26:49 +0000
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Subject: Re: [BEHAVE] [DNSOP] [v6ops] New Version Notification for draft-momoka-v6ops-ipv6-only-resolver-00.txt
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> On 17 Oct 2022, at 10:58 am, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> 
> Geoff Huston <gih@apnic.net> wrote:
>>> On 17 Oct 2022, at 7:53 am, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
>>> I think that's because
>>> recursive nameserves effectively have always done an equivalent to "happy
>>> eyeballs", so the risk is low.
> 
>> That certainly was not the case in 2015: https://www.potaroo.net/presentations/2015-10-04-dns-dual-stack.pdf
> 
>> I have not seen a large scale measurement since then but I suspect that nothing has changed. i.e.:
>> recursive resolvers do not do the equivalent of happy eyeballs
>> behaviour.
> 
> What I'm saying (based upon my understanding, and some long ago reading of
> code) is that recursive nameservers remember which NS were too slow or
> non-functional, and try to avoid them in the future.
> (I agree that this isn't exactly happy eyeballs: we don't do requests in
> parallel and pick the winner)
> 
> So if my v6 infrastructure for my authoritative nameservers fails, but the v4
> continues to work, that I'm not too badly off.  My experience is that this
> resilience can often mask failed servers for months :-)
> 

that’s not happy eyeballs - that’s just resilience across multiple service access points.

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