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Re: [OPSEC] Ted Lemon's Discuss on draft-ietf-opsec-dhcpv6-shield-05: (with DISCUSS and COMMENT)

Ted Lemon <Ted.Lemon@nominum.com> Mon, 09 February 2015 05:02 UTC

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From: Ted Lemon <Ted.Lemon@nominum.com>
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Date: Mon, 09 Feb 2015 00:01:43 -0500
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References: <20150207194616.20651.30892.idtracker@ietfa.amsl.com> <D5B607FA-9B47-4F1B-A0C1-FB0C94A97CDB@bogus.com> <Pine.LNX.4.64.1502071930100.25761@shell4.bayarea.net> <06B01D8E-981D-4D06-B6CC-3B5CE92782C5@nominum.com> <Pine.LNX.4.64.1502080813060.2950@shell4.bayarea.net> <D97E8BB3-0DB3-4B41-8C91-DBB3121DCEF7@nominum.com> <Pine.LNX.4.64.1502081507150.24776@shell4.bayarea.net> <72C73500-E6C4-4D75-9CFA-8FE4B012AB9E@nominum.com> <7516AD5C-1152-4020-B050-FA0383B58DBA@viagenie.ca> <Pine.LNX.4.64.1502081734120.24776@shell4.bayarea.net> <97C8D14E-D440-4625-8F26-83AF26917CF2@nominum.com> <54D83E7F.3040207@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [OPSEC] Ted Lemon's Discuss on draft-ietf-opsec-dhcpv6-shield-05: (with DISCUSS and COMMENT)
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On Feb 8, 2015, at 11:58 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> A middlebox that is trying to flush out a specific type of
> upper layer protocol (such as DHCPv6) needs to parse all extension
> headers, including ones it doesn't understand, in case there is
> an instance of the upper layer protocol behind it.
> 
> In the real world, that means that such middleboxes, if they are
> of the paranoid security persuasion, will discard packets that,
> as far as they are concerned, are unparseable.

Can you explain, in detail, what a DHCPv6 packet would look like that would get past a filter because either it used unknown extension headers, or an unknown protocol header?

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