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 2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether XXX brd XXX altname enp3s0 inet XXX brd XXX scope global dynamic noprefixroute ens5 valid_lft 604219sec preferred_lft 604219sec inet6 XXX scope link noprefixroute valid_lft forever preferred_lft forever 3: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000 link/sit XXX.XXX.XXX.XXX brd XXX