Re: [Doh] DNS Camel thoughts: TC and message size
Tony Finch <dot@dotat.at> Wed, 06 June 2018 14:18 UTC
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Date: Wed, 06 Jun 2018 15:18:32 +0100
From: Tony Finch <dot@dotat.at>
To: bert hubert <bert.hubert@powerdns.com>
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Subject: Re: [Doh] DNS Camel thoughts: TC and message size
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bert hubert <bert.hubert@powerdns.com> wrote: > > So, the DNS Camel has a suggestion. Specify that DNS messages carried over > DOH can be up to 65536 bytes large and note that truncation should be > handled as if the response was carried over TCP/53. > > Effectively this means that a TC response over DOH is almost always useless, > but this is no loss of functionality since it did not work over TCP/IP > either. We've not made anything worse here. > > And in general this is what I hope that DOH will restrict itself to: provide > access to the DNS protocol over HTTPS and not change DNS itself. Full agreement, and with the rest of your message. Thanks for writing it so that I didn't have to! I think the semantics of a DNS message transported over HTTPS should be the same as for DNS-over-TCP, wrt truncation, EDNS buffer sizes, and so forth. Tony. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ Fisher, German Bight: Variable 3 or 4. Moderate at first in west Fisher, otherwise slight. Fair. Moderate or good, occasionally poor.
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