Hi WG,

Jürgen has found an issue with the regex pattern for ipv6-address-link-local 
definition in rfc6991-bis, which is still in AUTH48, and is suggesting a fix 
for it below. Does anyone have any objection to the change?

Thanks

Begin forwarded message:

> From: Jürgen Schönwälder <[email protected]>
> Date: December 9, 2025 at 2:07:00 AM HST
> To: [email protected]
> Subject: bug in RFC 9911 to be (ipv6-address-link-local)
> Reply-To: Jürgen Schönwälder <[email protected]>
> 
> Hi,
> 
> RFC to be 9911 is in AUTH48 and independent of that I privately
> received a bug report concerning ipv6-address-link-local. The pattern
> appears to be wrong:
> 
> OLD:
> 
>         pattern '[fF][eE]80:.*';
> 
> NEW:
> 
>         pattern '[fF][eE][89aAbB].*';
> 
> The reason is that link-local addresses are identified by the prefix
> fe80::/10 and the original pattern does not capture all of the
> possible values.
> 
> My question now is how we deal with this procedurally. Please advice.
> 
> /js
> 
> --
> Jürgen Schönwälder              Constructor University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
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