[lxc-users] LXD Bridged IPv6

[Wojciech Arabczyk]

Are you sure, you have enabled ipv6 forwarding via sysctl?

On 22 April 2016 at 18:10, Nick Falcone <nick at nfalcone.net> wrote:
> Hello
>
> I have been banging my head up against a wall for a few days now trying
> to get IPv6 to work across my bridged interface for my containers.
>
> I have tried different VPS and dedicated servers as well as versions of
> Ubuntu 14.04, 15.10, and 16.04 to get this working.  The latest test all
> this info is from an Ubuntu 16.04 with the included version of LXD.
>
> First I install and run lxd init, I configure the bridge like so.
>
> lxdbr0    Link encap:Ethernet  HWaddr fe:82:af:f0:5d:ce
>           inet addr:10.195.87.1  Bcast:0.0.0.0  Mask:255.255.255.0
>           inet6 addr: 2604:a880:0:1010::623:2/64 Scope:Global
>           inet6 addr: fe80::40c6:84ff:fe18:22fb/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:294 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:21612 (21.6 KB)  TX bytes:2127 (2.1 KB)
>
> This is my host information too
>
> eth0      Link encap:Ethernet  HWaddr 04:01:d4:50:c4:01
>           inet addr:162.243.200.170  Bcast:162.243.200.255
>           Mask:255.255.255.0
>           inet6 addr: fe80::601:d4ff:fe50:c401/64 Scope:Link
>           inet6 addr: 2604:a880:0:1010::623:1/64 Scope:Global
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:76258 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:8187 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:111074998 (111.0 MB)  TX bytes:1230729 (1.2 MB)
>
> I launch and enter the first container it has this info:
>
> eth0      Link encap:Ethernet  HWaddr 00:16:3e:87:ff:20
>           inet addr:10.195.87.69  Bcast:10.195.87.255
>           Mask:255.255.255.0
>           inet6 addr: 2604:a880:0:1010:216:3eff:fe87:ff20/64
>           Scope:Global
>           inet6 addr: fe80::216:3eff:fe87:ff20/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:20 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:294 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:2175 (2.1 KB)  TX bytes:25728 (25.7 KB)
>
> so here I can see slaac is successful, but I cannot ping6
> 2604:a880:0:1010::623:1 (the host ipv6), I cannot ping google's public
> dns ipv6 either.  I CAN successfully ping6 2604:a880:0:1010::623:2 my
> bridge public IPv6.
>
> Seems like a routing issue, so on the host I add:
> ip -6 route add 2604:a880:0:1010:216:3eff:fe87:ff20 dev lxdbr0
>
>
> Still not able to ping6 out.  As a side note IPv4 works great.
>
> Am I missing something here? I cannot seem to find a lot of docs on this
> small part.  I thought to look at the demo containers on
> https://linuxcontainers.org/lxd/try-it/ but am unable to ping6 out on
> those, is this just a limitation?
>
> Thanks for any help in advance, would really like to use lxd for a
> project.  Also I do not care to redact these real IPs, they belong to a
> box only used for getting this working then will be destroyed.
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