[AusNOG] IPv6: Who's dual stacked? Why don't I look stacked?

Mark Andrews marka at isc.org
Fri Mar 8 12:07:29 EST 2013

In message <51392A34.3090507 at bowenvale.co.nz>, Don Gould writes:
> On 8/03/2013 12:10 p.m., Mark Andrews wrote:
> > IPv6 is given priority over IPv4 for most things.
> Yip....
> ...and when you light up v6 in your Mikrotik router without having it 
> all configured correctly, the dns data gets to your PPPoE clients, so 
> their web browser won't see the net any more as it's looking for 
> addresses in the v6 dns server that it can't reach...
> ...yes big opps, trying to just rush at it a bit fast there.
> My point being that it's all these little 'got ya's' that frighten the 
> crap out of me, and I'm sure I'm not the only one.

And when the server has 2 IPv4 addresses and one is unreachable the
client stalls.  This is a failure to test against multi-homed servers
not a failure of IPv6.

With IPv6 deployment increasing these bugs will now get fixed as
it is impossible to avoid multi-homed servers.  I wonder how many
billions could have been saved if these bugs were fixed rather than
money being spent global load balancers and all their support
infrastructure to detect unreachability.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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