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Re: [DNSOP] EDNS reply option to list unsupported options from query

Paul Vixie <paul@redbarn.org> Mon, 28 September 2015 17:21 UTC

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Date: Mon, 28 Sep 2015 10:21:54 -0700
From: Paul Vixie <paul@redbarn.org>
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To: Paul Hoffman <paul.hoffman@vpnc.org>
References: <20150928170341.GA23119@jurassic.l0.malgudi.org> <560974DC.8050605@redbarn.org> <20150928171452.GB23119@jurassic.l0.malgudi.org> <439F89B9-1CF0-4F12-A47C-6D11EB252766@vpnc.org>
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Cc: dnsop@ietf.org, Mukund Sivaraman <muks@isc.org>
Subject: Re: [DNSOP] EDNS reply option to list unsupported options from query
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Paul Hoffman wrote:
> Paul's "no" (which I agree with) shows what might be a fatal flaw in
> draft-muks-dnsop-dns-message-checksums: an attacker just needs to send
> fragments that look like they say "I don't understand the new EDNS0
> option". Does that make sense?

well, that was my reasoning for not including end to end checksumming in
EDNS0 itself (as a fixed field.)

-- 
Paul Vixie

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