1.安装桥工具
sudo apt install bridge-utils
2.建桥
sudo ip link add br0 type bridge
sudo ip link set br0 up
3.把eth0和eth1加进去
sudo ip link set eth0 master br0
sudo ip link set eth1 master br0
4.确认
bridge link
5.如果给桥增加IP
sudo ip addr add 192.168.100.10/24 dev br0