ifconfig performs the same function as ipconfig, but on a Linux, UNIX, or Macintosh system. Because Linux relies more heavily on command-line utilities than Windows, the Linux and UNIX version of ifconfig provides much more functionality than ipconfig. On a Linux or UNIX system, you can get information about the usage of the ifconfig command by using ifconfig --help. The following output provides an example of the basic ifconfig command run on a Linux system:

eth0      Link encap:Ethernet  HWaddr 00:60:08:17:63:A0
          inet addr:  Bcast: Mask:
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:911 errors:0 dropped:0 overruns:0 frame:0
          TX packets:804 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:5 Base address:0xe400
lo        Link encap:Local Loopback
          inet addr:  Mask:
          UP LOOPBACK RUNNING  MTU:3924  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0

Although the ifconfig command displays the IP address, subnet mask and default gateway information for both the installed network adapter and the local loopback adapter, it does not report DCHP lease information. Instead, you can use the pump s command to view detailed information on the DHCP lease including the assigned IP address, the address of the DHCP server, and the time remaining on the lease. The pump command can also be used to release and renew IP addresses assigned via DHCP and to view DNS server information.