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[v6ops] Same interface ID under several prefixes

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 17 June 2022 04:46 UTC

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Date: Fri, 17 Jun 2022 16:45:55 +1200
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
To: IPv6 Operations <v6ops@ietf.org>
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Subject: [v6ops] Same interface ID under several prefixes
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Hi,

As a side effect of a WG Last Call over on 6man, I've come up with a question about SLAAC implementations.

On Windows 10 (patched up to date), if you find the Interface ID in a stable GUA or ULA, it is also the Interface ID in the device's link-local address. I see the same identifier used for three different prefixes right now (GUA, ULA, LL). All you have to do is type "ipconfig" at the Windows command prompt.

However, it seems to me that this practice violates RFC 7217, which says:
"   o  The resulting Interface Identifiers must change when addresses are
        configured for different prefixes. "

Am I right to consider this a bug?

Regards
    Brian Carpenter

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