Comment 19 for bug 997978

Quoting Georg Leciejewski (<email address hidden>):
> @serge, thanks for your input. here Dom0 ifconfig, with 2 machines
> running.
>
> i setup br0 myself because the machines are running at hetzner, with
> special addon IP's so the vm's can be reached from the outside.
> (wiki.hetzner.de/index.php/KVM_mit_Nutzung_aller_IPs_-_the_easy_way) i
> am also evaluating the problem with hetzner support to ensure its not
> one of their routers in from of the Dom0.
>
> vnet0, vnet1 are the bridges created by libvirt, but the vm have static
> ip entries in /network/interfaces and are bound to br0 via libvirt.
>
> ------------------------------
>
> br0 Link encap:Ethernet HWaddr c8:60:00:e9:4a:2e
> inet addr:176.9.126.xx Bcast:0.0.0.0 Mask:255.255.255.255
> inet6 addr: fe80::ca60:ff:fee9:4a2e/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:5852477 errors:0 dropped:0 overruns:0 frame:0
> TX packets:4403013 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:2310013511 (2.3 GB) TX bytes:2588138678 (2.5 GB)
>
> eth0 Link encap:Ethernet HWaddr c8:60:00:e9:4a:2e
> inet addr:176.9.126.xx Bcast:176.9.126.95 Mask:255.255.255.192
> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
> RX packets:6623242 errors:0 dropped:35190 overruns:0 frame:0
> TX packets:4668377 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:2484375973 (2.4 GB) TX bytes:1715146205 (1.7 GB)
> Interrupt:17 Memory:fe500000-fe520000

One thing I notice here is that you have an ip address on eth0, which I
assume is bridged with br0?

When I bridge eth0 to br0 using the following /etc/network/interfaces:

=========================
auto lo
iface lo inet loopback

auto br0
iface br0 inet dhcp
 bridge_ports eth0

# The primary network interface
auto eth0
iface eth0 inet manual
=========================

I get the following ifconfig -a output:

=========================
br0 Link encap:Ethernet HWaddr fa:16:3e:59:27:16
          inet addr:10.55.60.89 Bcast:10.55.60.255 Mask:255.255.255.0
          inet6 addr: fe80::f816:3eff:fe59:2716/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:223 errors:0 dropped:0 overruns:0 frame:0
          TX packets:178 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:21627 (21.6 KB) TX bytes:19555 (19.5 KB)

eth0 Link encap:Ethernet HWaddr fa:16:3e:59:27:16
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:259 errors:0 dropped:0 overruns:0 frame:0
          TX packets:178 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:26871 (26.8 KB) TX bytes:19487 (19.4 KB)
=========================

What does your /etc/network/interfaces look like?