Linux change ip address

Q. How do I change ip address in Linux?

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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.

Change IP address under RedHat / CentOS / Fedora core Linux

=> Please read – Howto change and setup IP address in Redhat Linux

Change IP address under Debian / Ubuntu Linux

=> Please read – Howto change and setup IP address in Ubuntu / Debian based Linux distros

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82 comments… add one
  • bheem Jan 22, 2014 @ 18:16

    thanks

  • jan Apr 28, 2014 @ 7:22

    not working.i got an error that permission denied

  • jan Apr 28, 2014 @ 7:23

    SIOCSIFADDR: Permission denied
    SIOCSIFFLAGS: Permission denied
    SIOCSIFNETMASK: Permission denied
    SIOCSIFBROADCAST: Permission denied
    SIOCSIFFLAGS: Permission denied
    ……………..this is the error what i got

  • Raj Jun 19, 2014 @ 10:30

    Thanks its working and very helpful

  • Nadeem Nov 11, 2014 @ 5:10

    Hi friends
    Can anybody explain and help me find output of the following command

    IP=192.168.100.1 echo${IP:0:4}

    • Harm Nov 26, 2014 @ 12:51

      IP=192.168.100.1 will save 192.168.100.1 in a temporary variable named IP.

      echo${IP:0:4} will print that temporary variable starting from character 0, over a length of 4 characters.

      Output: 192.

  • tohid Feb 13, 2015 @ 3:47

    thanks for help :)

  • Morteza May 11, 2015 @ 7:15

    Thanks a lot.

  • mikicat May 27, 2016 @ 17:50

    Thanks, it helped a lot :)

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