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RE: A proposal for draft-ietf-6man-rfc4291bis-07

"Manfredi, Albert E" <albert.e.manfredi@boeing.com> Sat, 04 March 2017 00:53 UTC

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From: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
To: james woodyatt <jhw@google.com>
Subject: RE: A proposal for draft-ietf-6man-rfc4291bis-07
Thread-Topic: A proposal for draft-ietf-6man-rfc4291bis-07
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Date: Sat, 04 Mar 2017 00:53:23 +0000
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From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of james woodyatt

> I’m saying that my stack tries to comply with RFC 4862 which
> requires that it ignore PIO options where the Prefix Length is
> not 64 on link types that define the length of the IID as 64 bits
> in the relevant IPv6-over-link document.

That's 64-bit IIDs for SLAAC and link-local. According to RFC 2464. Not a constant for all IIDs, as I read it (used in present and past tense).

> If you send me a Prefix Length other than 64 bits, then I’m gonna
> ignore it. Just as RFC 4862 commands.

For SLAAC.

> It’s technically true that *if* my stack did not implement SLAAC, then
> it would have no need to comply with RFC 4862, and it could therefore
> accept Prefix Length other than 64 bits on Ethernet (and Wi-Fi) link
> types,

To me, this could be a problem. Even on Ethernet, it should accept other than /64 prefixes. If I'm assigned a /64, or a /60, or whatever, and I determine to be inadequate, I should be able to use RA and DHCPv6, behind my edge router, to create any number of subnets. RFC 4291 bis needs to accept this as legitimate, because other RFCs already do.

And, more importantly, RFC 4862 itself leaves the door opened for a revised implementation of SLAAC, allowing even SLAAC to be used in such a subnetted case.

Bert

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