Re: IPv6 routing /48s

[Mark Andrews <Mark_Andrews () isc org>]

In message <20081126012326.GR78345 () burnout tpb net>, Niels Bakker writes:
> * Mark_Andrews () isc org (Mark Andrews) [Wed 26 Nov 2008, 01:55 CET]:
> > In message <20081126002425.GO78345 () burnout tpb net>, Niels Bakker writes:
> > > * alh-ietf () tndh net (Tony Hain) [Wed 26 Nov 2008, 01:03 CET]:
> > > > In any case, content providers can avoid the confusion if they simply put
>  up
> > > > a local 6to4 router alongside their 2001:: prefix, and populate DNS with
> > > > both. Longest match will cause 2001:: connected systems to chose that dst
> ,
> > > > while 6to4 connected systems will chose 2002:: as the dst. There is no ne
> ed
> > > Huh?  Longest match done by web browsers and other applications?  Since 
> > > when?
> > FreeBSD 6 has is as part of the standard getaddrinfo() implementation.
>
> I don't see that do any differentiation between 2001::/32, 2002::/16 
> and 2000::/8; only between IPv6-mapped IPv4 addresses and various 
> interface/link/site-local addresses.  And even that function has a big
>   * XXX: we should standardize the functions and link them as standard
>   * library.
> warning stuck on top of it

        2002::/16 vs non 2002::/16 should be in the policy table.
        This is the default prefer ipv6 policy table for FreeBSD
        6.4-PRERELEASE.  There is also a alternate prefer ipv4 policy
        table that will be set if IPv6 is disabled.

Prefix                          Prec Label      Use
::1/128                           50     0        0
::/0                              40     1     4997
2002::/16                         30     2        0
::/96                             20     3        0
::ffff:0.0.0.0/96                 10     4        0

        Mark
        
>       -- Niels.
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews () isc org