IPv6 in Firefox: does it work?

[Per Jessen]

Yes, the link-local address can't be used like that - TBH, I don't
know why.
ping6 -I ethX FE80::21E:BFF:FE08:4CCB

Ah, yes, I remember that now. As I don't use v6 and I can't understand
the reason of having to specify the interface, so I always forget that
detail.

I've discovered the reason - the link local address may be assigned to
multiple interfaces, so to use it, you need to specify which interface.

[James Knott]

Post by Per Jessen
I've discovered the reason - the link local address may be assigned to
multiple interfaces, so to use it, you need to specify which interface.

Actually, the computer cannot know which interface a link local address
is on, unless it's somehow told. In the case of routers, the router
will announce itself and the computer will know which interface it's
connected to. So, if you're manually doing something, such as ping, you
have to specify the interface.

[Per Jessen]

Post by James Knott

Post by Per Jessen
I've discovered the reason - the link local address may be assigned
to multiple interfaces, so to use it, you need to specify which
interface.

Actually, the computer cannot know which interface a link local
address is on, unless it's somehow told.

Is that what happens during auto configuration or is there another way
of telling it? 'ip addr' appears to show e.g. eth0 having a link-local
address.