[PVE-User] Network problem resolved

Dietmar Maurer dietmar at proxmox.com
Thu May 15 12:59:05 CEST 2008

Hi all,

I just found one possible cause for network problems. By default, PVE
does not enable the STP protokol for vmbr0, which is wrong if there is
more than one bridge in the network (more that one pve host for

You need to enable STP on the bridge.

On the console type:

>  brctl stp vmbr0 on

To make it persistent modify your vmbr0 setup in

auto vmbr0
iface vmbr0 inet static
        address XXX.XXX.XXX.XXX
        netmask 255.XXX.XXX.XXX
        gateway XXX.XXX.XXX.XXX
        bridge_ports eth0
        bridge_stp on

- Dietmar

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