From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Sat,  1 Apr 2017 03:06:05 -0700
From: Kurt H Maier <khm@sciops.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Message-ID: <20170401100605.GB18054@wopr>
References: <CAJQxxwmyFsJQnwKNu1WJmcMKfk7R4HHjJE0Jp6BpkHp13m1O0g@mail.gmail.com>
	<20170401094653.GC54181@oneeye>
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Subject: Re: [9fans] IPV6
Topicbox-Message-UUID: b851ade8-ead9-11e9-9d60-3106f5b1d025

On Sat, Apr 01, 2017 at 02:46:53AM -0700, Ori Bernstein wrote:
> On Sat, Apr 01, 2017 at 08:36:55PM +1100, Bruce Ellis wrote:
> > Does anyone know what IPV6 addresses like fec0:0:0:ffff%1 mean and how to
> > make a real (plan9) IPV6 address from them.
> >
> > Regards.
> >
> > brucee
>
> The portion before the '%' is a plain old (link local) ipv6 address. The
> part after the '%' is a zone id. It's safe to ignore.
>
> Because link local addresses share prefixes, they may need to be told
> what interface to come out of. They can be ignored safely enough, or if
> you want you use an arbitrary string like 'fe80::%/net.alt' as the zone.
>
>

Careful.  fec0: is site-local, not link-local, which is fe80:.  I've
never seen a zone ID attached to a site-local address;  I thought the
zone shit was introduced at the same time they deprected the site-local
addresses...

ipv6 is a shitshow.  Cursory inspection of relevant RFCs does not lead
to clarity.  Godspeed.

khm