Broken DNS client resolvers (Was: Dealing with filtered 6to4 clients)

[Jeroen Massar]

Mikael Abrahamsson wrote:
> On Tue, 27 Oct 2009, Jeroen Massar wrote:
> 
>> I would say, explain then to the Ubuntu folks how to properly resolve
>> it, I am sure they will love you for it.
> 
> There is a bug reported that when you disassociate/reassociate wlan, it
> doesn't drop the IPv6 address between (so after a few movements between
> wlan:s, you'll have a bunch of IPv6 addresses from different /64s), the
> response from the ubuntu people was that this needed a feature
> enhancement, it wasn't a bug. The writing from the person in question
> seemed to indicate that this wasn't seen as an issue.

Had not seen that one, but the below might be a work-around for it:

In /etc/network/interfaces at the interfaces with the issues, add:
 pre-down ip -6 addr flush dev <name>
 pre-down ip -6 ro flush dev <name>

(Maybe a post-down, but I guess that if the interface is marked 'down'
one can't flush anymore, I noticed that once)

Can't test it, as I don't use Linux on my laptop (Windows XP FTW! etc :)
due to the crap wireless support on that platform. Oh and something with
having already loads of Linux boxes to SSH/VNC/X into if I need a
specific thing from such a box....

> So no, there is very little IPv6 love from Ubuntu.

That was the impression I am getting too, that even while they are at
least shipping IPv6-per-default-enabled, though I guess that might also
be to match features with other distros.

Greets,
 Jeroen

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