Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 09 November 2017 20:36 UTC

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Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
To: "Templin, Fred L" <Fred.L.Templin@boeing.com>, Fernando Gont <fgont@si6networks.com>, Lorenzo Colitti <lorenzo@google.com>
Cc: IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>, "6man-ads@tools.ietf.org" <6man-ads@ietf.org>, "v6ops-ads@ietf.org" <v6ops-ads@ietf.org>, "draft-ietf-v6ops-unique-ipv6-prefix-per-host@tools.ietf.org" <draft-ietf-v6ops-unique-ipv6-prefix-per-host@tools.ietf.org>
References: <be9724f5-2ff5-d90c-2749-ecae2c628b78@si6networks.com> <CAKD1Yr0_a2Qm8U4oK+BQU57DeDUD9i-o_+G+YhnH4pVXRxmxxQ@mail.gmail.com> <9d154133-a1de-7774-1589-c7069bf279ee@si6networks.com> <8efc982b0c784a6eac359d1ae9e50201@XCH15-06-08.nw.nos.boeing.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <10f7ae3d-1de0-d7fb-b5fb-fe7a609cbf05@gmail.com>
Date: Fri, 10 Nov 2017 09:36:13 +1300
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On 10/11/2017 07:19, Templin, Fred L wrote:
>>> I don't see how this is a protocol change. Sending RAs unicast is
>>> already allowed by RFC 4861, so this is just an operational practice.
>>
>> That's incorrect. We are talking about sending multicasted internetlayer
>> packets to a unicast link-layer address. There's nothing in RFC4861 that
>> suggests you should do that. RFC6085 says "you shouldn't drop packets if
>> they are internet-layer multicast but link-layer unicast". But
>> certainly, unless a protocol spec says otherwise, the normal mapping
>> applies.
> 
> On this point, I agree with Fernando. RFC4861 says that RAs can be unicast but
> that means unicast at both L2 and L3 (i.e., and not multicasted at L3). 

Who says that? As Fernando reminded us, RFC6085 says otherwise.

> RFC5214
> is an example of where both L2/L3 unicast are used in RAs in the spirit of RFC4861 .
> 
> Is there some reason why the requirements of this draft cannot be satisfied
> by L3 unicast?

Hosts listen for L3 multicast RAs.

   Brian