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From: Pete French <petefrench@ticketswitch.com>
Date: Tue, 12 Aug 2008 12:50:35 +0100
Cc: 
Subject: Re: neighbor discovery problem
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> Hum, 2a01:678:1:443::443 is a /64, and 2a01:678:100:2:: is on a /48, both
> have the "same" gateway, that is, the same box, which has :
>         inet6 2a01:678:1:443:: prefixlen 64
>         inet6 2a01:678:100:: prefixlen 48

O.K., that should work. My best advice here is to do what I did - which is
to disable 'pf' entirely and see if it works then. When it does you know
the IPv6 config is correct and can then work out which rule in 'pf' is
stopping it working when enabled. Sorry, but I van't think of anything else
right now, and I guess that may not be an option on a production machine.

-pete.