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Re: [Anima] Adam Roach's No Objection on draft-ietf-anima-grasp-12: (with COMMENT)

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 29 May 2017 02:34 UTC

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To: Adam Roach <adam@nostrum.com>, The IESG <iesg@ietf.org>
Cc: draft-ietf-anima-grasp@ietf.org, Sheng Jiang <jiangsheng@huawei.com>, anima-chairs@ietf.org, anima@ietf.org
References: <149549285151.31698.4933027087319976975.idtracker@ietfa.amsl.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Mon, 29 May 2017 14:34:22 +1200
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Subject: Re: [Anima] Adam Roach's No Objection on draft-ietf-anima-grasp-12: (with COMMENT)
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On 23/05/2017 10:40, Adam Roach wrote:
...
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> The document includes a couple of instances of "reasonable" in normative
> statements (e.g., "reasonable timeout"). I would strongly recommend
> having specific recommendations in the document where this happens.

Yes, will do.

> The CBOR definition has constants for IP_PROTO_TCP and IP_PROTO_UDP, but
> no way to register additional values with IANA. This does not seem
> future-proof.

Separate message to follow.

> Section 3.8.4 talks about behavior when a node has a "globally unique
> address," but provides no guidance for detecting this. Are nodes expected
> to check for link-local, zeroconf, RFC 1918, and RFC 6598 addresses? Any
> others?

Think IPv6, where this is quite well defined. The trouble is that it's
not well supported in the socket API. I think the best we can say in
the text is that it's implementation dependent.

(To find the code for this in the prototype, search for the comment
"This is a hack.")

We did want to write the text independent of the IP version as far
as possible, but trying to do this bit in IPv4 would be masochism.

Regards,

     Brian

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