Linux change IP address

Q. How do I change ip address in Linux?

A. There are different ways to change IP address in Linux

(a) Command Line tools
(b) Modify configuration files
(c) Use GUI tools

Task: Display current IP address and setting for network interface called eth0

Use ifconfig command:

# ifconfig eth0

Output:

eth0      Link encap:Ethernet  HWaddr 00:30:48:5A:BF:46
          inet addr:10.5.123.2  Bcast:10.5.123.63  Mask:255.255.255.192
          inet6 addr: fe80::230:48ff:fe5a:bf46/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:728204 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1097451 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:62774749 (59.8 MiB)  TX bytes:1584343634 (1.4 GiB)
          Interrupt:177

Task: Change IP address 

 

You can change ip address using ifconfig command itself. To set IP address
192.168.1.5, enter command:

# ifconfig eth0 192.168.1.5 netmask 255.255.255.0 up

# ifconfig eth0


To make permanent changes to IP address you need to edit configuration file according to your Linux distribution.