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

Owen DeLong <owen@delong.com> Tue, 23 February 2021 23:19 UTC

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From: Owen DeLong <owen@delong.com>
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Date: Tue, 23 Feb 2021 15:18:44 -0800
Cc: Fernando Gont <fgont@si6networks.com>, "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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To: Gert Doering <gert@space.net>
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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 Feb 20, 2021, at 6:09 AM, Gert Doering <gert@space.net> wrote:
> 
> Hi,
> 
> On Thu, Feb 18, 2021 at 09:58:29PM -0300, Fernando Gont wrote:
>> On 18/2/21 21:36, Brian E Carpenter wrote:
>>> So, my thought (and it belongs on this thread OR the 'IPv6 addressing: Gaps?' one) is something like:
>>> 
>>> We should abolish, delete, expunge and deprecate the word "scope" from all IPv6 documents. It clearly doesn't have an agreed meaning, so it is worse than useless.
>> 
>> FWIW, wfm. :-)
> 
> Seconded.
> 
>> (Modulo: the multicast folks do use "scope" in a more "successful" way, 
>> IIRC?)
> 
> Their definitions are at least somewhat more clear on what a "scope" is -
> send a packet to that address, and this is how far it will get.

Well, yes and no… Most of the scopes that are defined have extraordinarily variable
meaning:
	Admin-Local
	Site-Local
	Organization-Local

However, yes, Interface, Link, and Global are well defined even though it is common for
people to fail to grasp the difference between interface-local and link-local.

I will, however, argue that link-local scope is well defined as a scope for IPv6 addresses in fe80::/10.

> In practice, how much IPv6 multicast is there which is not "node" and
> "link" scoped?  Or, to be even more picky, not "link" scoped?

A lot less than there should be.

Owen