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

Fernando Gont <fgont@si6networks.com> Mon, 15 February 2021 04:44 UTC

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To: Mark Andrews <marka@isc.org>
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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From: Fernando Gont <fgont@si6networks.com>
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Date: Mon, 15 Feb 2021 01:41:45 -0300
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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)
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On 14/2/21 21:44, Mark Andrews wrote:
> 
> 
>> 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.

Only difference is that ULAs are kind of guaranteed to be disjoint. BUt 
yes, you're right.


-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
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