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Debian: failing to add netwok bridge for kvm

Hi

I have a running debian server, netwok configured on eth0 with ip aaa.bbb.ccc.140

Now I want to add a bridge to use kvm on that server.

I add the following to /etc/network/interfaces:

iface br1 inet static
        address aaa.bbb.ccc.186
        netmask 255.255.255.0
        broadcast aaa.bbb.ccc.255
        network aaa.bbb.ccc.0
        pre-up brctl addbr br1

As soon as I restart the networking service the network is not available anymore (not the ip configured for eth0 and not the one for br1 )

What would fix this, or what is the correct procedure to add a bridge for kvm?

(I can not experiment to much as it is a live system)

Thanks
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Zephyr ICT
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Thanks, I will try that