Linux change ip address

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:10.0.1.6  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 192.168.1.3, enter command:

# ifconfig eth0 192.168.1.3 netmask 255.255.255.0 up

# ifconfig eth0



To make permanent changes to IP address you need to edit configuration file in /etc/sysconfig/network-scripts/ifcfg:eth0


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

          DEVICE=eth0

          BOOTPROTO=static

          BROADCAST=172.19.97.255
          IPADDR=192.168.1.3

NETMASK=255.255.255.0

NETWORK=172.19.97.0

          ONBOOT=yes

          TYPE=ethernet

Hit Escape save and exit

# service network restart

Now check the static Ipaddress by giving following command

#ifconfig

Output:
eth0      Link encap:Ethernet  HWaddr 00:30:48:5A:BF:46
          inet addr:192.168.1.3  Bcast:192.168.1.255  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

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