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Re: [v6ops] IPv6 link-local and URLs @ IETF119

Lorenzo Colitti <lorenzo@google.com> Tue, 19 March 2024 08:58 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Tue, 19 Mar 2024 18:57:57 +1000
Message-ID: <CAKD1Yr0GLA0ufT8F10iDQNx0NsdDjMz17X3Q1HR9VuBJU_EvcA@mail.gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: George Michaelson <ggm@algebras.org>, "v6ops@ietf.org WG" <v6ops@ietf.org>, Toerless Eckert <tte@cs.fau.de>, "Murray S. Kucherawy" <superuser@gmail.com>
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Subject: Re: [v6ops] IPv6 link-local and URLs @ IETF119
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On Tue, Mar 19, 2024 at 6:11 PM Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> > How can there be no such thing? If an app connects to a global address,
> the stack must pick an interface. So such a concept must exist.
>
> RFC4007 says that an implementation MAY have a default interface for link
> locals when the user doesn't supply one via fe80::1%name. Linux doesn't do
> that. Since link-locals aren't routeable, you just get 'invalid argument'
> from sendmsg()  if you don't supply a valid interface number.
>

It's pretty trivial for a browser to do this though: whenever it converts a
link-local address from a URL to its internal data structures, determine
the system default network and use that to populate the scope ID.

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