在/etc/network/interfaces中使用以下配置与Ubuntu建立虚拟网桥
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
代码：创建网桥接口。每个网桥都需要一个适配器，这里是我的物理网卡eth11。为确保其正常工作，请重新启动和关闭接口。
导致网络服务重新启动...
service networking restart
service networking status
...显示类似的错误
ifup[2304]: Cannot find device "brOnline"
dhclient[2330]: Error getting hardware address for "brOffline": No such device
如果您的接口被称为标准br0，则听起来像：
default:
Error getting hardware address for "br0": No such device
最佳答案
未安装网桥工具
我从一个系统迁移到另一个。目标操作系统是新安装的17.10。所缺少的是桥接工具：
sudo apt-get install -y bridge-utils
由于缺少工具，因此无法创建网桥...
现在
ifconfig显示了我闪亮的桥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
Hint which helped me to find the solution