1. ip link add br0 type bridge # ip link delete br0
    2. ip link set br0 up # ip link set br0 down
    3. ip link set eth0 master br0 # ip link set eth0 nomaster
    1. nspid=$(docker inspect -f '{{.State.Pid}}' ubuntu)
    2. mkdir -p /var/run/netns/
    3. ln -s /proc/${nspid}/ns/net /var/run/netns/${nspid}
    1. ip link add vnet-n type veth peer name vnet-w