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

Mark Andrews <marka@isc.org> Mon, 15 February 2021 00:45 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)
From: Mark Andrews <marka@isc.org>
In-Reply-To: <b847db29-d75f-030e-4f7f-5450fde0cd20@si6networks.com>
Date: Mon, 15 Feb 2021 11:44:55 +1100
Cc: David Farmer <farmer@umn.edu>, Ted Lemon <mellon@fugue.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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References: <160989494094.6024.7402128068704112703@ietfa.amsl.com> <6fe3a45e-de65-9f88-808d-ea7e2abdcd16@si6networks.com> <F4E00812-E366-4520-AE17-7BB46E28D575@gmail.com> <CAN-Dau3iOjjU+FLpdtA7nqfKRX+sjjSanAU8U-O3pH-k5nSoig@mail.gmail.com> <a3fbfb94-90ae-961c-a2ab-33ade27e074e@si6networks.com> <672bd5e6-bdce-5915-1082-1ed30d3c5980@gmail.com> <f65952f1-fcd1-0918-4dd8-256f822524ee@si6networks.com> <886ad526-b62c-aef2-96ca-62e7829692b5@gmail.com> <8ed7f569-9ee8-08d6-cf17-a72bc2c7b854@si6networks.com> <B364BF30-23F1-497A-8928-5AB0D718204B@fugue.com> <30730d0f-5a90-f7ce-d9ce-6f4aef75bde2@si6networks.com> <9DD46169-462F-454B-A5B2-26FCB1B0C6EF@fugue.com> <ab86907f-0efc-8b7d-e4b6-1482418b4ef8@si6networks.com> <A68D439D-A493-40F0-ACE3-0C52ACD8F92D@fugue.com> <CAN-Dau3p4nGw=vz8h6rJAg62tnvusp+qn=soKiknNT_Y7_G0Uw@mail.gmail.com> <b847db29-d75f-030e-4f7f-5450fde0cd20@si6networks.com>
To: Fernando Gont <fgont@si6networks.com>
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> On 15 Feb 2021, at 11:32, Fernando Gont <fgont@si6networks.com> wrote:
> 
> On 14/2/21 20:51, David Farmer wrote:
>> On Sun, Feb 14, 2021 at 15:34 Ted Lemon <mellon@fugue.com <mailto:mellon@fugue.com>> wrote:
>>    On Feb 14, 2021, at 4:14 PM, Fernando Gont <fgont@si6networks.com
>>    <mailto:fgont@si6networks.com>> wrote:
>>>    That's not a legitimate use for GUAs.  Whereas in the case of
>>>    ULAs, that the *intended* usage.
>>    Untrue. ULAs are intended to be globally unique. Your practical
>>    objections are correct, but have nothing to do with the
>>    architecturally defined scope of a ULA.
>> Ok, ULAs clearly belong in the Global Scope, we don’t want to use Zone Indexes or Identifiers with them. 
> 
> For ULAs you might need zone indexes or otherwise specify the interface to employ, particularly if you're sending to a ULA address, and you don't have any ULAs configured. or, if you have e.g. two interfaces, each of which employing ULAs, but you're sending packets to a totally different ULA prefix.  Depending on which interface you choose you might or might not be able to reach there.

How’s that different from being in disjoint GUA spaces?  The node in disjoint GUA spaces needs routing information so it should run a routing daemon.  ULA is not special in this respect.

> -- 
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
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> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org