Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 13 February 2021 20:04 UTC

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Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
To: Fernando Gont <fgont@si6networks.com>, Ted Lemon <mellon@fugue.com>, Fred Baker <fredbaker.ietf@gmail.com>
Cc: IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
References: <160989494094.6024.7402128068704112703@ietfa.amsl.com> <6fe3a45e-de65-9f88-808d-ea7e2abdcd16@si6networks.com> <F4E00812-E366-4520-AE17-7BB46E28D575@gmail.com> <b2e51a89-e8a7-9ddb-643d-63a98569b03c@si6networks.com> <CB9EA5F4-A241-46A4-A371-B2A1BFB8C72F@fugue.com> <dff93a2e-f4f8-01c9-ce88-c2dbb20a04f1@si6networks.com> <759637FF-77C7-41EA-8671-73988AD48873@fugue.com> <9877D352-E9BB-453B-A676-D2B5C546C1C2@gmail.com> <11035C3E-BA75-4B9D-A047-B2AA1DE23BEA@fugue.com> <b3f1c53f-c22d-c9fb-6094-9a15d79fcd43@si6networks.com> <b9972eb4-b4db-e82d-12ec-1cfcc75a9e45@gmail.com> <6345cc51-48e4-abba-58b8-001b70efb325@si6networks.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <9768b3fe-9d2d-fe5c-0a6c-3c56dacef0da@gmail.com>
Date: Sun, 14 Feb 2021 09:03:40 +1300
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On 13-Feb-21 16:17, Fernando Gont wrote:
> On 13/2/21 00:08, Brian E Carpenter wrote:
>> OK, I have deleted all the content (but basically I agree with Ted
>> Lemon). IMHO:
>>
>> ULAs SHOULD be treated exactly like GUAs for all practical purposes
>> (including using a default router for them), with the exception that
>> they MUST be filtered by border routers at a domain boundary that is
>> defined administratively. The only extra requirement is that ULA
>> prefixes MUST be unique within that domain boundary. That's all, I
>> think.
> 
> FWIW, in the context of draft-ietf-6man-slaac-renum, it has been argued 
> that: "only phase out GUAs if you hear of new GUAs, and only phase out 
> ULAs if you hear of new ULAs" -- i.e., that they should be treated 
> differently.
> 
> (Note: I'm not necessarily arguing in favor of this.)

I think it makes sense, since the basic scenario is to have one ULA
for local communication and one GUA for Internet-wide communication.
Having more than one ULA prefix on a link is rather unnatural.
 
>> As for the word "scope" and the phrase "global scope" it may be best
>> to not use them at all. We originally had a false notion of
>> concentric rings of address scope, but reality is a very complex Venn
>> diagram. Even link-local may stop being very meaningful as we see
>> more and more mesh networks. That will be much harder to handle than
>> any aspect of ULAs.
> 
> Deprecate/rev RFC4007? :-)

I think we'd have a lot of documents to touch if we wanted to resolve
this rather than just live with it

   Brian