Trying to bridge NIC. What does this error mean?

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http://serverfault.com – I would like to bridge between br0 and tap0 for my OpenVPN server, but I get the error at the bottom of this post. Background The server have one physical eth0 with IP xxx.xxx.68.58. The bridge should have xxx.xxx.85.5 and the tap0 NIC, where the OpenVPN clients gets an IP from is in the range xxx.xxx.85.50 - xxx.xxx.85.100. To make the bridge I do: #!/bin/bash br="br0" tap="tap0" eth="eth0:0" eth_ip="xxx.xxx.85.5" eth_netmask="" eth_broadcast="" openvpn --mktun --dev $tap brctl addbr $br brctl addif $br $eth brctl addif $br $tap ifconfig $tap promisc (HowTos)