Setting up a virtual bridge with Ubuntu with following config in /etc/network/interfaces
auto brOffline
iface brOffline inet static
address 192.168.5.10
netmask 255.255.255.0
bridge_ports eth11
bridge_stp off
bridge_fd 0.0
pre-up ifdown eth11
pre-up ifup eth11
post-down ifdown eth11
code: creating a bridge interface. Every bridge needs an adapter, here my physical network card eth11. To make sure it's working bringing the interface down and up again.
causes the restarting of the networking service ...
service networking restart
service networking status
... to display an error simmilar to
ifup[2304]: Cannot find device "brOnline"
dhclient[2330]: Error getting hardware address for "brOffline": No such device
if your interface is called as the standard br0 it would sound like:
default:
Error getting hardware address for "br0": No such device
Bridge util was not installed
I moved from one system to an other. Target OS was a newly installed 17.10. the thing what was missing were the bridge utileties:
sudo apt-get install -y bridge-utils
The bridge simply could not be created because of missing tools...
Now ifconfig shows my shiny bridge
brOffline: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.5.10 netmask 255.255.255.0 broadcast 192.168.5.255
inet6 fe80::6a05:caff:fe51:8eff prefixlen 64 scopeid 0x20<link>
ether 68:05:ca:51:8e:ff txqueuelen 1000 (Ethernet)
RX packets 2 bytes 501 (501.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 107 bytes 10316 (10.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0