Re: [Doh] [Ext] DNS Camel thoughts: TC and message size
Mukund Sivaraman <muks@mukund.org> Fri, 08 June 2018 10:24 UTC
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Date: Fri, 08 Jun 2018 15:54:45 +0530
From: Mukund Sivaraman <muks@mukund.org>
To: Robert Edmonds <edmonds@mycre.ws>
Cc: Dave Lawrence <tale@dd.org>, DoH WG <doh@ietf.org>
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References: <20180606093212.GA23880@server.ds9a.nl> <alpine.DEB.2.11.1806061501340.10764@grey.csi.cam.ac.uk> <F5774061-35B9-477F-ADDA-8BB3472F30EF@icann.org> <alpine.DEB.2.11.1806071121350.1809@grey.csi.cam.ac.uk> <5B71AC15-80F4-427B-BABA-1BE3C514145F@icann.org> <23321.25400.502754.584769@gro.dd.org> <20180608024515.jkimytwch7lstkxi@mycre.ws>
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Subject: Re: [Doh] [Ext] DNS Camel thoughts: TC and message size
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On Thu, Jun 07, 2018 at 10:45:15PM -0400, Robert Edmonds wrote: > Dave Lawrence wrote: > > Paul Hoffman writes: > > > Tony is completely correct here. DNS messages have well-defined > > > length limits: 512-or-more-depending if carried over UDP, and 65535 > > > if carried over TCP. > > > > Right. And completely undefined over any other transport. There is > > no intrinsic limit to the limit of a DNS message, compression pointers > > notwithstanding. > > No, there is an intrinsic limit to the size of a DNS message. If I'm not > mistaken: > > 12 octets header > > 1 question resource record: > 255 octets QNAME > 2 octets QTYPE > 2 octets QCLASS > > 3 response sections: > 65535 RR's per section: > 255 octets NAME > 2 octets TYPE > 2 octets CLASS > 4 octets TTL > 2 octets RDLENGTH > 65535 octets RDATA > > 12 + 1*(255+2+2) + 3*65535*(255+2+2+4+2+65535) = 12936609271 octets, or, > about 13 gigs. I think BIND will happily load, zone transfer (in and out) and store an RRset in memory that didn't fit in 64kB. Initially for catalog zones, we'd have used such an RRset as there's no 64kB transfer limit to an RRset. However, anything over 64kB cannot be queried for as the server will fail to construct a reply. Mukund
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- Re: [Doh] [Ext] Are we missing an architecture? (… Mukund Sivaraman
- Re: [Doh] [Ext] Are we missing an architecture? (… Ray Bellis
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- Re: [Doh] [Ext] Are we missing an architecture? (… Mukund Sivaraman
- Re: [Doh] [Ext] Are we missing an architecture? (… Mukund Sivaraman
- Re: [Doh] [Ext] Are we missing an architecture? (… Ben Schwartz
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- Re: [Doh] [Ext] Are we missing an architecture? (… Ray Bellis
- Re: [Doh] [Ext] Are we missing an architecture? (… bert hubert
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- Re: [Doh] [Ext] Are we missing an architecture? (… Dave Lawrence
- Re: [Doh] [Ext] Are we missing an architecture? (… Paul Hoffman
- Re: [Doh] [Ext] Are we missing an architecture? (… Tom Pusateri
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- Re: [Doh] DNS Camel thoughts: TC and message size Petr Špaček
- Re: [Doh] DNS Camel thoughts: TC and message size Tony Finch
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- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Andrew Sullivan
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… George Michaelson
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Paul Hoffman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Tony Finch
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… bert hubert
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Paul Hoffman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Martin J. Dürst
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Paul Hoffman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Tony Finch
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Ray Bellis
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- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Robert Edmonds
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Mateusz Jończyk
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- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… John Dickinson
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Ray Bellis
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Mukund Sivaraman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Mukund Sivaraman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Tony Finch
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Martin Thomson
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Mark Nottingham
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- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Ólafur Guðmundsson
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- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Andrew Sullivan
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… bert hubert
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] Are we missing an architecture? (was Re… Mark Nottingham
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Mukund Sivaraman
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] Are we missing an architecture? (was Re… Andrew Sullivan
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Andrew Sullivan
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Andrew Sullivan
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Patrick McManus
- Re: [Doh] [Ext] DNS Camel thoughts: TC and messag… Dave Lawrence
- Re: [Doh] Are we missing an architecture? (was Re… Dave Lawrence
- Re: [Doh] Are we missing an architecture? (was Re… bert hubert
- Re: [Doh] Are we missing an architecture? (was Re… Dave Lawrence
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