[Cerowrt-devel] Current state of ipv6 in openwrt barrier breaker

Dave Taht dave.taht at gmail.com
Mon Dec 10 03:41:59 EST 2012

I just noticed this thread went over to cerowrt-users and
cerowrt-devel is the right place to discuss these issues.

---------- Forwarded message ----------
From: Steven Barth
Date: Mon, Dec 10, 2012 at 9:38 AM
Subject: Re: [Cerowrt-users] IPv6 router advertisements on custom interfaces
To: cerowrt-users <cerowrt-users at lists.bufferbloat.net>

Fyi I've commited a new ipv6-support version to OpenWrt yesterday.

This includes (partly untested) all features I want to see in there
for OpenWrt except the integration of dnsmasq-dhcpv6 (which will
follow later once the dynamic configuration features have been added
to it) and the WebUI which is still on the ToDo.

So far the current IPv6-featureset is:

* Support for native IPv6 with static configuration
* Support for native IPv6 with DHCPv6-Prefix Delegation
* Support for native IPv6 without PD via relaying or masquerading
* Support for 6in4, 6to4 and 6rd
* Prefixes are automatically split up and distributed over
downstream-interfaces OR by choice mapped to an ULA-address (NPT66).

Help, documentation and configuration examples for yesterdays version
can be found here (there were a few changes for the new NPT-support):


Especially the NPT / NAT-related stuff has seen very little testing
and of course only works with a Kernel >= 3.7 and ip6tables >= 1.4.17.

On 10.12.2012 08:56, Dave Taht wrote:
> Radvd is going away in the BB ("barrier breaker" - openwrt head)
> version of openwrt, fairly soon. It deserves to die...
> There is going to be a merger of the DHCPv6/SLAAC and naming
> functionalities in dnsmasq and the dynamicism of the new ipv6-support
> package, which also includes a spanking new dhcpv6-pd client..
> Also planned is to (once the 3.7 kernel lands) make npt66 the default
> (for most users). So in a couple weeks, all the underlying ipv6
> infrastructure in openwrt and cerowrt is going to change.
> As to whether the 6in4 case is fully handled as of now in that system,
> damned if I know. Same goes for 6to4... I put the ipv6-support package
> into cerowrt 3.6.9-5, all forms of ipv6 are blocked at the lincs lab,
> can't test it, right now.
> As for how to fix it in cerowrt 3.3.8, it was always problematic as
> hell, and I'm glad the work is being re-architected in BB by two of
> the most competent people I know, and I've signed cerowrt (and thus,
> y'all) up to test it when it comes out. It would be great to recruit
> more help, because *this time* we're going to get it right, come hell
> or high water.
> I'm very pleased, in particular, with dnsmasq's naming support for
> slaac. It "just works".
> On Mon, Dec 10, 2012 at 12:04 AM, Michael Richardson <mcr at sandelman.ca> wrote:
>> First question, why are there two radvd processes?
>> 3343 root       964 S    /usr/sbin/radvd -C /var/etc/radvd.conf -m stderr_sys
>> 3345 root       964 S    /usr/sbin/radvd -C /var/etc/radvd.conf -m stderr_sys
>> Is this just a thread issue?
>> second question, none of my custom interfaces are in /var/etc/radvd.conf?
>> Can I hack /etc/config/firewall directly rather than go through the UI?
>> I think so....?
>> Could I attach blinking LEDs to VLANs?
>> (ps: whatever problems I had with ethernet mii between my cerowrt and
>> a cisco 200-26 switch in the summer, seems to have gone away)
>> On an IPv6 interface which is not my uplink, I think that IPv6 gateway
>> should be blank.  That the router should advertise iself.
>> I also think that the words "Send router soliciations" is wrong, that it
>> should say, "Send router advertisements".
>> I had to put my custom interfaces into /etc/config/radvd.
>> config interface
>>          option interface 'trusted'
>>          option AdvSendAdvert '1'
>>          option AdvRouterAddr '1'
>>          option AdvLinkMTU '1480'
>>          option ignore '0'
>>          option IgnoreIfMissing '1'
>>          option AdvSourceLLAddress '1'
>>          option AdvDefaultPreference 'medium'
>>          option AdvOtherConfigFlag '1'
>> config prefix
>>          option interface 'trusted'
>>          list prefix ''
>>          option AdvOnLink '1'
>>          option AdvAutonomous '1'
>>          option AdvRouterAddr '0'
>>          option ignore '0'
>> I don't see a place in the UI where this is edited, but I could be
>> missing it.
>> --
>> ]       He who is tired of Weird Al is tired of life!           |  firewalls  [
>> ]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
>> ] mcr at sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
>>     Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE>
>>                         then sign the petition.
>> _______________________________________________
>> Cerowrt-users mailing list
>> Cerowrt-users at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/cerowrt-users

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Dave Täht

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