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Re: [lamps] Paul Wouters' No Objection on draft-ietf-lamps-5g-nftypes-08: (with COMMENT)

Paul Wouters <paul.wouters@aiven.io> Fri, 02 December 2022 03:27 UTC

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From: Paul Wouters <paul.wouters@aiven.io>
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Date: Thu, 01 Dec 2022 22:27:41 -0500
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References: <3F1BCE66-AAB4-49EC-9481-215008A58F05@vigilsec.com>
Cc: IESG <iesg@ietf.org>, draft-ietf-lamps-5g-nftypes@ietf.org, LAMPS Chairs <lamps-chairs@ietf.org>, LAMPS <spasm@ietf.org>, tim.hollebeek@digicert.com
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To: Russ Housley <housley@vigilsec.com>
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Subject: Re: [lamps] Paul Wouters' No Objection on draft-ietf-lamps-5g-nftypes-08: (with COMMENT)
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On Dec 1, 2022, at 11:48, Russ Housley <housley@vigilsec.com> wrote:
> 
> Paul:
> 
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>> 
>> Thanks for the document.
>> 
>> I just have one question.
>> 
>>  This extension MUST NOT be marked critical.
>> 
>> Why not? One can argue this is greenField deployment but it would be a rather big one :P
>> 
>>> From what I am reading, this extension is required for 5g, so why not mark it critical if
>> the extension is not understood?
> 
> TLS is being used for authentication, integrity, and confidentiality within the 5G core, so I do not think we can ensure  that this is a greenField deployment.

I think I was unclear.  The document says these NFtypes are required for 5G. So they MUST be present. If that is the case, a system that doesn’t understand NFtypes fails. This type of extension understanding requirement is usually signalled with marking it critical, so I didn’t understand why this critical marking was a MUST NOT.

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