Name

ifconfig

Synopsis

ifconfig lo0 localhost up
ifconfig interface ip-address netmask mask

The first form configures the loopback interface. The second form assigns the specified IPv4 address and subnet mask to interface. FreeBSD and Solaris allow you to replace the address and netmask parameters (including the keywords) with a CIDR address.

Displaying information about network interfaces

ifconfig [options] [interface]

Display the configuration of the specified interface(s).

-a

Display data for all interfaces (not supported by HP-UX).

-l (FreeBSD and AIX)

List all network interfaces.