Change IP on Linux

To change IP Address on Linux we have to had a root access.
I have tested this on Red Hat Linux AS 3.

After login as root then do the simple step below:

1. Modify the configuration file
with the command line:

# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=static
BROADCAST=172.26.11.255
IPADDR=172.26.11.192
NETMASK=255.255.0.0
NETWORK=172.26.11.0
ONBOOT=yes
TYPE=Ethernet

Then modify the entry IPADDR, NETMASK with
your own. You may change like this:

IPADDR=172.26.7.122

You may also modify other entry as you need,
then save the change.

2. Restart the network service with command line:

# /etc/init.d/network restart

If successed will look like below:

Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Setting network parameters: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]

3. You may check the change with this command line:

# ifconfig -a

As a result the following information will display on the screen.
The eth0 interface has changed.

eth0 Link encap:Ethernet HWaddr 00:11:09:06:9A:24
inet addr:172.26.7.122 Bcast:172.26.11.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:673374 errors:0 dropped:0 overruns:0 frame:0
TX packets:513551 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:562369198 (536.3 Mb) TX bytes:92885906 (88.5 Mb)
Interrupt:11 Base address:0xec00

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:53122 errors:0 dropped:0 overruns:0 frame:0
TX packets:53122 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1652248 (1.5 Mb) TX bytes:1652248 (1.5 Mb)