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We don't say that. 4301 says that implementations MAY support AH and MUST support ESP.
This creates a problem for implementations if in future a new application or a protocol mandates the use of AH.
I will even go a step further and say that newer protocols should just assume ESP-NULL and not even bother with AH if they can do with just ESP.
From: email@example.com [mailto:firstname.lastname@example.org]
Sent: Wednesday, January 04, 2012 7:46 PM
To: Bhatia, Manav (Manav)
Cc: Nico Williams; email@example.com
Subject: Re: [IPsec] Avoiding Authentication Header (AH)
>>>>> "Manav" == Manav Bhatia <Bhatia> writes:
Manav> Hi Nico,
>> Advising (and updating said advice as circumstances change)
>> use-IPsec protocol designers as to when to use ESP and/or AH is
>> something we should do. Deprecating AH seems like a nice idea,
>> but if there's good reasons to still use it, then maybe not.
Manav> We're not talking about deprecating or killing AH. I concede
Manav> that I did allude to it in my first draft, but then changed
Manav> the tone based on the WG feedback, to say that we should
Manav> "avoid" AH wherever possible.
This is the status quo already.
Why do we need this draft?
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