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

"Paul Hoffman" <paul.hoffman@vpnc.org> Mon, 28 September 2015 17:19 UTC

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From: Paul Hoffman <paul.hoffman@vpnc.org>
To: Mukund Sivaraman <muks@isc.org>
Date: Mon, 28 Sep 2015 10:19:20 -0700
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References: <20150928170341.GA23119@jurassic.l0.malgudi.org> <560974DC.8050605@redbarn.org> <20150928171452.GB23119@jurassic.l0.malgudi.org>
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Subject: Re: [DNSOP] EDNS reply option to list unsupported options from query
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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?

--Paul Hoffman

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