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1.2.4. Loopback Interface
The loopback interface is identified by the system as lo and has a default IP address of 127.0.0.1. It can be viewed using the ip command.
ip address show lo
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