Comment 9 for bug 692775

Tried the same. OK if done on *ONE* system. I can ping every vm running on this Server.

Now back to my setup.

First system:
ifconfig eth0.5 0.0.0.0 up
brctl addbr vm5
brctl addif vm5 eth0.5
ifconfig vm5 192.168.1.1/24 up

Second system:
ifconfig eth0.5 0.0.0.0 up
brctl addbr vm5
brctl addif vm5 eth0.5
ifconfig vm5 192.168.1.2/24 up

On first system:
ping 192.168.1.1
-> OK. Works
ping 192.168.1.2
-> no output. Only lost pings

On second system:
ping 192.168.1.2
-> OK. Works.
ping 192.168.1.1
-> no output. Only lost pings

Both systems are connected.

Adding VMs to the vm5-bridge on first system all guests can ping each other.
Adding VMs to the vm5-bridge on second system all guests can ping each other.

if a guest on first system tries to ping one on second system, the guest on second system is unreachable.
If a guest on second system tries to ping one on first system, the guest on first system is unreachable.