registry team mailing list archive

[Tore Anderson <tore@xxxxxx>]

Jeremy,

RFC 3484 specifies the following priorities («IPv6» here implies non-
6to4) - it does not matter which is the source and which is the
destination:

1) IPv6 <-> IPv6
2) 6to4 <-> 6to4
3) IPv4 <-> IPv4
4) 6to4 <-> IPv6

These haven't changed.  However, if you want #4 to be sorted above #3,
you can easily accomplish that by disabling the special casing of
2002::/16 by adding the following lines to gai.conf:

label ::1/128       0
label ::/0          1
#label 2002::/16     2
label ::/96         3
label ::ffff:0:0/96 4
label fec0::/10     5
label fc00::/7      6
label 2001:0::/32   7

precedence  ::1/128       50
precedence  ::/0          40
#precedence  2002::/16     30
precedence ::/96          20
precedence ::ffff:0:0/96  10

If you also want Teredo-based connectivity to be preferred above IPv4,
comment out the line with 2001:0::/32 as well.

Tore

-- 
Please assign global scope to RFC 1918 addresses in getaddrinfo()
https://bugs.launchpad.net/bugs/555210
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