On Mon, Apr 23, 2012 at 11:43 AM, David Woodhouse <dw...@infradead.org> wrote:
> On Mon, 2012-04-23 at 20:14 +0200, Gert Doering wrote:
>> (Now, what I'm not sure whether OpenWRT already has this: to fully
>> utilize IPv6 over here, what you need to have is dynamic IPv6 prefix
>> support using DHCP-PD.  As in "router queries ISP for a prefix, ISP
>> assigns 2001:db8:1::/56, router assigns 2001:db8:1:1::/64 to LAN,
>> 2001:db8:1:2::/64 for WiFi and informs radvd that this is the prefix
>> to be used".  AVM's Fritz!Box does this nicely today, but not with
>> open source components...)
>
> It's documented here: http://wiki.openwrt.org/doc/uci/dhcp6c
>
> I haven't actually tried it; I have to manually configure the range of
> Legacy IP addresses anyway, so it's easy enough to configure the IPv6
> too. But I *will* try it, and make sure it interoperates with my ISP
> correctly.

It has long been a goal of mine to have both cerowrt and openwrt
builds ready for world ipv6 launch day and be able to fully meet this
spec:

http://www.worldipv6launch.org/form/?q=3

I'd like to think I'm close. But truly getting there will require more
folk to want to do it, by that date. Please goferit!

All the machines in the bloatlab are native dual-stack
(see, for example, http://europa.lab.bufferbloat.net/cerowrt/ ), and I
have several running dhcp-pd, sorta. It's my last remaining bug. I
tried dibbler (crashes after 24 hrs), and isc-dhcp (too big, too
complex) and have fallen back to wide. I have reports of it working in
New Zealand.

The biggest problem that I have (in America, at least) is that
comcast's first rollout is only going to be a single /64 delegation,
which breaks cerowrt's multiple interface scheme, but will hopefully
work ok with openwrt. Still, /64 only is crazy and I'm told they
intend to do better by fall.

Certainly other providers are handing out /56s and /60s.

> We should make sure it's enabled by default.

Latest build for me, wide-dhcpv6 is installed but not enabled by default.
After some testing, it will.

> There should be no need for anyone to disable IPv6, except perhaps if
> they mean by that "turn off automatic 6to4". If they're stuck in the
> 20th century and don't have IPv6 routing, they won't get IPv6. What's to
> disable?
>
> (And no, I wouldn't advocate 6to4 being enabled by default anyway).

I had it enabled by default during comcast's trials. It worked great,
on their network (and having a /48 was good too). It didn't work very
well elsewhere, so it's in there, but disabled by default.

 I also have HE tunnels and 6rd working.

I'm more of the opinion that ipv6 needs to be made to work, using
every method possible, and if possible, those methods should be able
to co-exist, using policy routing. That proves to be hard.

>
> --
> dwmw2
>
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>



-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://www.bufferbloat.net
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