[tsvwg] Re: [v6ops] Carrying large DNS packets over UDP in IPv6 networks

mohamed.boucadair@orange.com Fri, 14 June 2024 14:10 UTC

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To: Suresh Krishnan <suresh.krishnan@gmail.com>, "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] Carrying large DNS packets over UDP in IPv6 networks
Thread-Index: AQHavlHr9dTzxvDvuUmQ0yGgaWuGeLHHRjTQ
Date: Fri, 14 Jun 2024 14:10:10 +0000
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Subject: [tsvwg] Re: [v6ops] Carrying large DNS packets over UDP in IPv6 networks
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Hi Suresh, all,

(ccing tsvwg)

FWIW, large DNS packets was the main driver for the FRAG UDP option: https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-udp-options-32#section-11.4. 

On the reco in the draft, I'm not sure how this can be put into effect given that the client does not know whether the reply will be large or not when it reaches out a resolver.

Also, when you mention "DNS over QUIC" are you referring to DoQ per RFC 9250? If so, I'm afraid that there are many implications (e.g., authentication, compatibility with the presence of local forwarders). Also, if DoQ is recommended, why not DNS over TLS or DNS over HTTPS? You may refer to DNR/DDR (RFC9463/9462) for the discovery matters of whether local resolvers support DoQ, DoH, DoT, etc. + which authentication domain name to be used to authenticate a server.

Cheers,
Med

> -----Message d'origine-----
> De : Suresh Krishnan <suresh.krishnan@gmail.com>
> Envoyé : vendredi 14 juin 2024 13:56
> À : v6ops@ietf.org
> Objet : [v6ops] Carrying large DNS packets over UDP in IPv6
> networks
> 
> 
> Hi all,
>   At the last 6man meeting in Brisbane, Jared Mauch brought up an
> issue with large DNS packets carried over UDP in IPv6 networks.
> Bob and I have written a draft recommending the use of TCP or
> QUIC for such large packets instead of UDP.
> 
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2
> Fdatatracker.ietf.org%2Fdoc%2Fdraft-hinden-v6ops-
> dns%2F&data=05%7C02%7Cmohamed.boucadair%40orange.com%7Cbdb1f68f5a
> a84a89263a08dc8c690ce2%7C90c7a20af34b40bfbc48b9253b6f5d20%7C0%7C0
> %7C638539630010730229%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDA
> iLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdat
> a=ts2PogUeq3dRA0NulYmQaJaCydLLhhJeM463qV%2BHgVU%3D&reserved=0
> 
> We would greatly appreciate your comments on this draft.
> 
> Thanks
> Suresh
> _______________________________________________
> v6ops mailing list -- v6ops@ietf.org
> To unsubscribe send an email to v6ops-leave@ietf.org
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