1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback XXX brd XXX inet XXX scope host lo valid_lft forever preferred_lft forever inet6 XXX scope host noprefixroute valid_lft forever preferred_lft forever 3: enp0s31f6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000 link/ether XXX brd XXX 10: wwp0s20f0u2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether XXX brd XXX 12: enp0s20f0u1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000 link/ether XXX brd XXX inet XXX brd XXX scope global dynamic noprefixroute enp0s20f0u1 valid_lft 3562sec preferred_lft 3562sec inet6 XXX scope link noprefixroute valid_lft forever preferred_lft forever