I don't run an Ubuntu host so can't provide ready answers, but libvirt
has a way to inspect the configuration of the bridge device, so I'd
hope the same should be available

1. If a custom dnsmasq is used like in libvirt, at least with my
distro (openSUSE) the default app should be uninstalled or configured
for a non-default port so that the custom dnsmasq can listen on its
default port by itself.

2. in libvirt (vm manager), the following is displayed and can be managed
- Stop and start the virtual network configured for the bridge device
- View and verify the real bridge device name
- Configure DHCP (yes/no)
- Configure address space

So, I hope there is some CLI or GUI manager in Ubuntu which can
display/manage the same (who knows, maybe it's even libvirt under the
hood)

Tony

On Sat, Aug 10, 2013 at 12:12 PM, Serge Hallyn <serge.hal...@ubuntu.com> wrote:
> Quoting Tony Su (ton...@su-networking.com):
>> FYI
>> I avoid the whole issue assigning different IP addresses by creating
>> my br devices using libvirt (vm manager).
>
> He's running lxc under ubuntu, so he already has a lxcbr0
> bridge with dnsmasq running just as you get with libvirt.
> That's why what he's getting is confusing.
>
> My best guess right now is that the containers are not
> cnofigured to use dhcp, though it seems unlikely as that's
> simply not how they are set up by default.
>
> -serge

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