root@os-net:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:25:90:e3:34:b0 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.21/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.0.1.21/24 brd 10.0.1.255 scope global eth0:1
       valid_lft forever preferred_lft forever
    inet6 fe80::225:90ff:fee3:34b0/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:25:90:e3:34:b1 brd ff:ff:ff:ff:ff:ff
    inet 23.235.227.138/29 brd 23.235.227.143 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::225:90ff:fee3:34b1/64 scope link
       valid_lft forever preferred_lft forever
4: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
    link/ether 6a:12:db:ac:48:b5 brd ff:ff:ff:ff:ff:ff
5: br-int: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether ca:6a:a6:40:31:40 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::1809:17ff:fe5e:fc8b/64 scope link
       valid_lft forever preferred_lft forever
6: br-ex: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 00:25:90:e3:34:b1 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f8e0:94ff:fe8d:3248/64 scope link
       valid_lft forever preferred_lft forever
7: br-tun: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 0a:12:70:2b:af:42 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::543e:4fff:fe80:418e/64 scope link
       valid_lft forever preferred_lft forever