Re: 9.0-beta3 preferring ipv4 over ipv6 with
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Thomas Steen Rasmussen <thomas@gibfest.dk> wrote
in <4E9AA874.5070403@gibfest.dk>:
th> On 14.10.2011 10:26, Thomas Steen Rasmussen wrote:
th> > On 14-10-2011 10:09, Hiroki Sato wrote:
th> >> Thanks. There is no problem with the source address selection.
th>
th> I don't understand this comment. I would say that I do
th> have problems with the source address selection -
th> otherwise it would be preferring ipv6, right ?
I mean the address selection is working properly. Your problem is
because the default ipv6_prefer policy prefers IPv4 addresses when
the source IPv6 addr is in 2002::/16, the destination IPv6 address is
not in the same prefix, and IPv4 addresses can be used for the both.
It is not a bug of the selection mechanism.
The ipv6_prefer policy is defined in RFC 3484 2.1 and this policy
chooses a src IPv6 addr in 2002::/16 only if the dest addr is also in
the same prefix. You can remove the special rule for 2002::/16 by
putting the following lines as /etc/ip6addrctl.conf and reboot the
system:
::1/128 50 0
::/0 40 1
#2002::/16 30 2
::/96 20 3
::ffff:0:0/96 10 4
By installing the above, IPv6 address will be preferred even if it is
in 2002::/16.
I am still not sure why there is a difference between 8.X and 9.X on
your box because the code is almost the same. I guess no policy was
installed when you used an 8-stable system.
-- Hiroki
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