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 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
inet6 fe80::829b:20ff:fe4b:f874/64 scope link
valid_lft forever preferred_lft forever
19: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN group default qlen 3
link/ppp
inet 172.20.116.18 peer 172.20.0.1/32 brd 172.20.116.18 scope global ppp0
valid_lft forever preferred_lft forever
inet6 2403:ac00:0:3:385d:2189:3ec5:3501/64 scope global temporary dynamic
valid_lft 259195sec preferred_lft 85795sec
inet6 2403:ac00:0:3:4500:2404:93ac:4b2b/64 scope global dynamic
valid_lft 259195sec preferred_lft 172795sec
inet6 fe80::4500:2404:93ac:4b2b/10 scope link
valid_lft forever preferred_lft forever