1. 清除物理网卡ip地址(192.168.1.22),使其工作在链路层接收所有数据包
ip addr del 192.168.1.22/24 dev eth0
ip addr add 0.0.0.0 dev eth0
2. 创建网桥br0并把接口eth0加入br0
ip link add br0 type bridge # ip link delete br0
ip link set br0 up # ip link set br0 down
ip link set eth0 master br0 # ip link set eth0 nomaster