1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:32:b4:02:f7 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
21: eth0@if22: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:77:15:cd brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 252.30.244.56/8 metric 100 brd 252.255.255.255 scope global dynamic eth0
       valid_lft 3308sec preferred_lft 3308sec
    inet6 fe80::216:3eff:fe77:15cd/64 scope link 
       valid_lft forever preferred_lft forever