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Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt

DY Kim <dykim6@gmail.com> Sat, 05 August 2017 23:40 UTC

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From: DY Kim <dykim6@gmail.com>
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Date: Sun, 06 Aug 2017 08:40:01 +0900
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt
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The firm reference pole

	RFC7421

along with a number of docs prescribing 64 bits for the IID length

	RFC2464, RFC2467, RFC2470, RFC2497, RFC2590, RFC3146, RFC5072
	(thanks to Tatuya Jinmei for the list)

would be enough to ensure that

	SLAAC will accept only 64-bit long prefixes
		and produce 64-bit long IIDs.

not to disturb the wide deployment of SLAAC implementation as such.

RFC4291bis doesn’t need (or even ought not to, for it's about ‘architecture’) mention or mandate the length of IID, leaving such implementation specific details to companion docs like those listed above.

---
DY

> On 6 Aug 2017, at 05:16, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
>>> Analysis of the 64-bit Boundary in IPv6 Addressing
>>> https://tools.ietf.org/rfc/rfc7421.txt
> 
> Which says:
> "The first purpose of this document is to explain the
> advantages of the fixed IID length.  Its second purpose is to
> analyze, in some detail, the effects of hypothetically varying the
> IID length."
> 
> I suggest that everybody reads the whole RFC, which does indeed
> cover those points. The historical reasons why we chose 64 are
> somewhat irrelevant today.

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