Re: [Tsv-art] Tsvart last call review of draft-ietf-opsec-ipv6-eh-filtering-06

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 27 November 2018 00:33 UTC

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To: Benjamin Kaduk <kaduk@mit.edu>, Fernando Gont <fgont@si6networks.com>
Cc: tsv-art <tsv-art@ietf.org>, OPSEC <opsec@ietf.org>, Christian Huitema <huitema@huitema.net>, ietf <ietf@ietf.org>, draft-ietf-opsec-ipv6-eh-filtering.all@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Tue, 27 Nov 2018 13:33:42 +1300
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Subject: Re: [Tsv-art] Tsvart last call review of draft-ietf-opsec-ipv6-eh-filtering-06
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On 2018-11-27 12:18, Benjamin Kaduk wrote:

<snip>

> Perhaps I am confused, but IIUC this document discusses values placed in
> the IPv6 "Next Header" field, some of which are EHs and some of which are
> not.  Values not recognized to the processing entity may be EHs or may be
> "next protocol"s, and if the value is not recognized there is no way to
> know which is the case.  Ergo, filtering out unknown values that might be
> EHs is also filtering out unknown next-protocols, which seems really bad
> for the future flexibility of the internet.

You are not at all confused. That's one of the reasons we wrote RFC7045. 

But for a paranoid firewall, it doesn't matter. The logic is 
unrecognized -> drop in either case.

(This is part of the chain of reasoning that led to
draft-carpenter-limited-domains, but that's another story.)

    Brian