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Re: About AH (was Re: [Errata Held for Document Update] RFC8200 (5933))

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 03 March 2020 21:13 UTC

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Subject: Re: About AH (was Re: [Errata Held for Document Update] RFC8200 (5933))
To: Michael Richardson <mcr+ietf@sandelman.ca>, "ipv6@ietf.org" <ipv6@ietf.org>, "Eric Vyncke (evyncke)" <evyncke=40cisco.com@dmarc.ietf.org>
Cc: "suresh.krishnan@gmail.com" <suresh.krishnan@gmail.com>
References: <FE156CF2-3C58-43A3-A858-E25FE38C322B@cisco.com> <12656.1583267228@localhost>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <deffa1ba-3ee6-892d-4ab0-dfa888738867@gmail.com>
Date: Wed, 04 Mar 2020 10:13:52 +1300
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On 04-Mar-20 09:27, Michael Richardson wrote:
> 
> Eric Vyncke \(evyncke\) <evyncke=40cisco.com@dmarc.ietf.org> wrote:
>     > IMHO, any specification breaking AH (e.g., by modifying the NextHeader
>     > in transport mode) should clearly note that it 'breaks AH' or
>     > constraints its use; but, this is still acceptable for an IETF standard
>     > specification IMHO to 'break AH'.
> 
>     > Finally, I have spent 10+ years designing and deploying IPsec VPNs and
>     > very few of them were using AH and when using AH it was in tunnel mode
>     > (except OSPFv3) and until ESP was extended to have authentication.
> 
> I concur.
> AH had one remaining use, which was to secure extension headers, such as for
> use with SEND.  We screwed up the definition of how unknown SPI# should be
> processed with AH (the header should be skipped, but the result is rejection).
> So, we couldn't use AH when we did SEND.
> 
> AH is useless.

Exactly. Why it isn't Historic is a mystery to me, but out of scope for these WGs.

    Brian

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