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
19: eth0@if20: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:3b:a8:ec brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 252.17.31.96/8 metric 100 brd 252.255.255.255 scope global dynamic eth0
       valid_lft 2020sec preferred_lft 2020sec
    inet6 fe80::216:3eff:fe3b:a8ec/64 scope link 
       valid_lft forever preferred_lft forever