[lxc-users] No outgoing traffic with bridged network and public IP address from container

othiman othiman at gmx.de
Thu Sep 11 11:11:25 UTC 2014

Hmm. The old server is also at the same provider and there it is working 
without a problem (ubuntu 12.04 and lxc 0.7.5). In addition binding the address to the old server in the same way, the setup works 
without a hassle.
Binding the to an aliasing interface (br0:0) on the new 
host is working, too...


On 11.09.2014 13:02, Fajar A. Nugraha wrote:
> On Thu, Sep 11, 2014 at 4:05 PM, othiman <othiman at gmx.de 
> <mailto:othiman at gmx.de>> wrote:
>     Hi everyone,
>     I already posted this to askubuntu.com <http://askubuntu.com>
>     (http://askubuntu.com/questions/522457/lxc-container-no-outgoing-traffic-with-bridged-network-and-public-ip-address),
>     but I think this might be a better place to find help.
>     I try to setup a LXC container with bridged network on ubuntu
>     14.04.1, but the outgoing traffic seems to be blocked. Ping
>     another IP than the container's one is not working. Actually I
>     tried this with a working container of a ubuntu 12.04 host moved
>     to new hardware and a recent ubuntu 14.04, but the problem also
>     applies to a new created ubuntu 14.04 container.
>     I should mention that if I bind the IP address to an aliasing
>     interface of the host directly, pinging inside and outside to the
>     host is working correctly.
>     I hope someone has an idea what I am doing wrong.
> Sounds suspiciously similar to a dedicated server/colo setup where 
> your provider only allows one MAC on each port. Is that the case for 
> you? If yes, then short answer is you can't use bridge.
> SInce your container IP ( and host IP ( is 
> on a different subnet mask, I suspect that your provider routes the 
> additional IP to your main IP. In which case you should use routed setup.
> -- 
> Fajar
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> lxc-users at lists.linuxcontainers.org
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