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Dhika Cikul » Blog Archive » How to change CentOS IP Address

How to change CentOS IP Address

Posted by cikul | Posted in Linux | Posted on 19-08-2008-05-2008


To change centOS IP Address, you must know what network interface used with your linux installation, to check network interface, you can use this command :

root@server [/]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:E0:4D:7D:DE:D9
          inet addr:  Bcast:  Mask:
          RX packets:12317238 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13264360 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3501403361 (3.2 GiB)  TX bytes:1239051254 (1.1 GiB)
          Interrupt:21 Base address:0xd000

lo        Link encap:Local Loopback
          inet addr:  Mask:
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:269263 errors:0 dropped:0 overruns:0 frame:0
          TX packets:269263 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:166075105 (158.3 MiB)  TX bytes:166075105 (158.3 MiB)

at this example, the machine have interface eth0 that interface configured with IP

To change IP for interface eth0, the simplest way is using ifconfig command itself, for example :

root@server [/home]# ifconfig eth0 netmask

After run that command, you can check your ip using ifconfig command again.

ifconfig command create temporary IP address change, if you reboot your server, you will see that your IP still not change. If you want make permanent ip change, you must edit files under /etc/sysconfig/network-scripts/

root@server [/]# cd /etc/sysconfig/network-scripts/
root@server [/etc/sysconfig/network-scripts]# ls
./          ifdown-bnep*   ifdown-isdn@    ifdown-sl*      ifup-eth*    ifup-isdn@   ifup-routes*    init.ipv6-global*
../         ifdown-eth*    ifdown-post*    ifdown-tunnel*  ifup-ippp*   ifup-plip*   ifup-sit*       net.hotplug*
ifcfg-eth0  ifdown-ippp*   ifdown-ppp*     ifup@           ifup-ipsec*  ifup-plusb*  ifup-sl*        network-functions
ifcfg-lo    ifdown-ipsec*  ifdown-routes*  ifup-aliases*   ifup-ipv6*   ifup-post*   ifup-tunnel*    network-functions-ipv6
ifdown@     ifdown-ipv6*   ifdown-sit*     ifup-bnep*      ifup-ipx*    ifup-ppp*    ifup-wireless*
root@server [/etc/sysconfig/network-scripts]# cat ifcfg-eth0

on that example, you see that ifcfg-eth0 configure with IP, use can use text editor to change that IP, after make change you must restart your network to make your new IP active.

root@server [/]# /etc/init.d/network restart


root@green [/]# service network restart

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Comments posted (11)

This is cool!


Thanks! But a queston – how to configure a second alias ip address on the same interface ?

thanks for information how to change address in CENTOS. Is this tutorial are same for other Linux Distro ?


Megacool Blog indeed!… if anyone else has anything it would be much appreciated. Great website Enjoy!…

how many so…

tank u

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