jack@Jack-Ubuntu:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
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 pfifo_fast state UP group default qlen 1000
link/ether 08:9e:01:66:2b:66 brd ff:ff:ff:ff:ff:ff
inet6 2001:da8:a000:554:9c09:1e22:5684:7ac0/64 scope global temporary dynamic
valid_lft 600851sec preferred_lft 81851sec
inet6 2001:da8:a000:554:a9e:1ff:fe66:2b66/64 scope global dynamic
valid_lft 2591998sec preferred_lft 604798sec
inet6 fe80::a9e:1ff:fe66:2b66/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 80:9b:20:4b:f8:74 brd ff:ff:ff:ff:ff:ff
6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN group default qlen 3
link/ppp
inet 172.20.81.102 peer 172.20.0.1/32 brd 172.20.81.102 scope global ppp0
valid_lft forever preferred_lft forever
inet6 2403:ac00:1:584b:f10c:e413:c9d1:d3bd/64 scope global temporary dynamic
valid_lft 600854sec preferred_lft 81854sec
inet6 2403:ac00:1:584b:5d6d:c070:cbaf:956/64 scope global dynamic
valid_lft 2591984sec preferred_lft 604784sec
inet6 fe80::5d6d:c070:cbaf:956/10 scope link
valid_lft forever preferred_lft forever
jack@Jack-Ubuntu:~$