Re: IPv6 traffic stats

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On Wed, 12 Nov 2008, Iljitsch van Beijnum wrote:
In my opinion, this is a bug. This is the default policy table from a FreeBSD system, which is the RFC 3484 table IIRC:

You should probably bring this up on 6MAN WG list then.

 ip6addrctl
Prefix                          Prec Label      Use
: : 1/128                           50     0        0
: :/0                              40     1   646064
2002::/16                         30     2        0
: :/96                             20     3        0
: : ffff:0.0.0.0/96                 10     4        0

The last line catches IPv4. It's two steps below the 6to4 prefix. However, the fact that the label for the 6to4 prefix doesn't match the ::/0 label means that IPv4 will be used.

This happens on FreeBSD and XP, and I assume also on Vista. But not on MacOS, because it doesn't implement the policy table. I don't know about Linux. (If you want to test, try to connect to 6to4test.runningipv6.net and see what happens. Both addresses are unreachable, though.)

I'm not sure whether you're agreeing with me or something else; I don't see where you're saying the bug is. But if we start talking about issues in RFC3484, it should happen on 6MAN list.

Your test is inconclusive due to the fact that the A record is a private address. Depending on whether the connecting host has a global or private address, the results are different (see my mail to Remi for more).

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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