Re: network/bridging problems

[Arun Khan <knura9@gmail.com>]

On Wed, Oct 2, 2013 at 12:35 PM, Ross Boylan <ross@biostat.ucsf.edu> wrote:
> I setup bridging on my system for kvm, but on restart of the host system
> (no guest VM's running) could not ping outside my local network.
>
> Bringing the bridge down corrected the  problem, but I'm trying to
> understand what is going on, and how I can make networking from the VM's
> work.
>
> /etc/network/interfaces has (on the advice of a wiki page on Debian and
> kvm)
> auto br0
> iface br0 inet dhcp
>    pre-up ip tuntap add dev tap0 mode tap user root
>    pre-up ip link set tap0 up
>    bridge_ports all tap0
>    bridge_stp off
>    bridge_maxwait 0
>    bridge_fd      0
>    post-down ip link set tap0 down
>    post-down ip tuntap del dev tap0 mode tap
>
> My one connected interface, eth2, was brought up by hotplug with no
> mention in interfaces.

Your 'physical' device eth0/eth2 or whatever needs to be added to the bridge.

List the output of  'brctl -show'

-- Arun Khan