RHEL / Red hat / Fedora / CentOS Linux Static IP Configuration

For static IP configuration you need to edit the following files using a text editor such as vi. Edit /etc/sysconfig/network as follows, enter:
# cat /etc/sysconfig/network
Sample static ip configuration:
 
NETWORKING=yes
HOSTNAME=server1.cyberciti.biz
GATEWAY=192.168.1.254
 
Edit /etc/sysconfig/network-scripts/ifcfg-eth0, enter:
# cat /etc/sysconfig/network-scripts/ifcfg-eth0
Sample static ip configuration:
 
# Intel Corporation 82573E Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=static
DHCPCLASS=
HWADDR=00:30:48:56:A6:2E
IPADDR=192.168.1.10
NETMASK=255.255.255.0
ONBOOT=yes
 
Edit /etc/resolv.conf and setup DNS servers, enter:
# cat /etc/resolv.conf
Sample static IP configurations:
 
search cyberciti.biz
nameserver 192.168.1.254
nameserver 8.8.8.8
nameserver 202.54.2.5
 
Finally, you need to restart the networking service, enter:
# /etc/init.d/network restart
To verify new static ip configuration for eth0, enter:
# ifconfig eth0
# route -n
# ping 192.168.1.254
# ping google.com

Debian / Ubuntu Linux Static IP Configuration

Edit /etc/hostname, enter:
# cat /etc/hostname
Sample ip config:
 
server1.cyberciti.biz
 
Edit /etc/network/interfaces, enter:
# cat /etc/network/interfaces
Sample static ip config:
 
iface eth0 inet static
     address 192.168.1.10
     network 192.168.1.0
     netmask 255.255.255.0
     broadcast 192.168.1.255
     gateway 192.168.1.254
 
Edit /etc/resolv.conf and setup DNS servers, enter:
# cat /etc/resolv.conf
Sample dns static IP configurations:
 
search cyberciti.biz
nameserver 192.168.1.254
nameserver 8.8.8.8
nameserver 202.54.2.5
 
Finally, you need to restart the networking service under Debian / Ubuntu Linux, enter:
# /etc/init.d/networking restart
Type the following commands to verify your new setup, enter:
# ifconfig eth0
# route -n
# ping google.com

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