Re: [dns-privacy] DNS over DTLS
Tariq Saraj <tariqsaraj@gmail.com> Fri, 02 December 2016 13:32 UTC
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References: <CAAdbxrrgKRvUUgWQUFvxQiwua_DsochdZm83pi_Zgx_wo4-GPg@mail.gmail.com> <20161201150121.5be7b162@pallas.home.time-travellers.org> <CAAdbxro1Cu-MAW+kYe3YE0YPb27TjVPOdLtA_jF=0=OQgmCcHw@mail.gmail.com> <87h96mvnba.fsf@alice.fifthhorseman.net>
From: Tariq Saraj <tariqsaraj@gmail.com>
Date: Fri, 02 Dec 2016 18:32:09 +0500
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To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
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Cc: Shane Kerr <shane@time-travellers.org>, dns-privacy@ietf.org
Subject: Re: [dns-privacy] DNS over DTLS
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HI Daniel, So true, and thank you very much.... also thanks to Shane.... On Fri, Dec 2, 2016 at 11:48 AM, Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote: > On Fri 2016-12-02 01:22:40 -0500, Tariq Saraj wrote: > > Thanks for your detailed reply, the point I am trying to highlight is the > > changes in TCP for DNS which is "TCP out of order packet delivery, i.e. > the > > OOOP". > > I think you're referring to "out of order processing" for DNS requests > by a recursive resolver. While necessary for reasonable performance > over TCP, I don't think this approach remediates TCP > head-of-line-blocking. > > imagine a client who makes two queries across a TCP connection in rapid > succession, the first for slow.example and the second for fast.example. > > many traditional (old, unoptimized) DNS recursive resolvers will try to > find the answer for slow.example before they even start making the > queries needed for fast.example. they might not even read the second > query from the TCP connection before responding to the first one. > > OOOP says that a DNS recursive resolver should read queries as they come > in over TCP, even if it still has responses pending for other queries > from that connection. > > IOW, the dns resolution *itself* should not block based on slow DNS > responses from the authoritative servers it queries. > > but none of that resolves the problem of TCP head-of-line blocking. if > one packet carrying a query on one TCP connection gets dropped, the > receiving server can't see any of the rest of the packets until the > earlier packet is re-sent. (and vice versa for replies going from > recursor to stub) > > does this make sense? > > --dkg > -- Regards Tariq Saraj Riphah Institute of Systems Engineering, Islamabad
- [dns-privacy] DNS over DTLS Tariq Saraj
- Re: [dns-privacy] DNS over DTLS Shane Kerr
- Re: [dns-privacy] DNS over DTLS Tariq Saraj
- Re: [dns-privacy] DNS over DTLS Daniel Kahn Gillmor
- Re: [dns-privacy] DNS over DTLS Tariq Saraj