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

Philip Homburg <pch-ipv6-ietf-7@u-1.phicoh.com> Thu, 07 January 2021 21:38 UTC

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To: ipv6@ietf.org
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, IPv6 Operations <v6ops@ietf.org>
Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
From: Philip Homburg <pch-ipv6-ietf-7@u-1.phicoh.com>
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In-reply-to: Your message of "Fri, 8 Jan 2021 09:23:51 +1300 ." <7a61fb44-b5f1-9601-4fab-5b676f0cad83@gmail.com>
Date: Thu, 07 Jan 2021 22:38:34 +0100
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>There's nothing in RFC4007 suggesting that a non-default zone applies
>to global addresses. Rather the opposite:
>
>"And, when supported, the index value zero at each
>scope SHOULD be reserved to mean "use the default zone"...
>Those default indices can also be used
>as the zone qualifier for an address for which the node is attached
>to only one zone; e.g., when using global addresses."
>
>So I'd say that Linux and MacOS have got it wrong, and FreeBSD
>and Windows are right. Portable code certainly can't assume that
>the interface ID can be used for global unicast.

I don't see any text that disallows accepting an interface ID on a GUA.
0 is the default zone. But that does not rule out other zones.

In my opinion this is a useful feature, that could be added to a bis
document as a MAY.

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