Comment 9 for bug 24828

On Fri, Jul 28, 2006 at 04:23:11AM -0000, Martin Hosken wrote:
> Dear Trent,
> > Disabling IPv6 increaseing the throughput of your internet connection
> > makes no sense and I think thats just circumstantial, sorry :)
> >
> > The place where it *does* make a difference is the speed of new
> > connections, it seems that in some cases certain dns servers ignore
> > requests for IPv6 records and so everytime you try to resolve an IPv6
> > address it waits for them to timeout.
> >
>
> It is worse than that. In the time it takes for the IPv6 DNS request to
> fail the application times out on making its connection.
> > These broken DNS servers should really be fixed, but the last point
> > could work, not to bother looking up, guess it would fix some of these
> > cases.
> >
>
> It's not a question of the DNS server being dumb it's usually some cheap
> ADSL router/modem that is sitting between the computer and a good DNS
> server. Often configuring the router to pass a real DNS server address
> to the dhcp client is enough to solve the problem. But not all routers
> allow you to configure the dhcp server in them sufficiently.
>
> So perhaps the real fix is to provide a way to turn off IPv6 DNS
> requests. But I guess that is impossible without turning off IPv6 in
> general. How much IPv6 takes off depends to a large extent on what MS do
> with Vista, I would suspect.
> > Could someone who experiences and is willing to let me login to their
> > machine please contact me? I'd love to try this as its never really
> > affected me.
> >
> I'll send you directly, offline, a couple of tcpdump traces to compare.
> One is dns request to the D-Link 504T ADSL modem/router and the other is
> directly to a DNS server with packets merely routed by the modem.
>
> --
> IPv6 should be disabled by default
> https://launchpad.net/bugs/24828

--
Trent Lloyd <email address hidden>
Bur.st Networking Inc.