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Setting Up A Static IP Address on UNIX system


Setting Up A Static IP Address Using The Command Line

Log on as root, change directory to /etc/sysconfig/networking/devices and list all available devices.
# cd /etc/sysconfig/networking/devices
# ls
Find the configuration file corresponding to the NIC for which you want to set a static IP and edit it.
# vi ifcfg-eth0
I prefer using “joe” as a text editor rather than “vi”. You can install “joe” by issuing “yum install joe”. To invoke joe’s help menu, type “CTRL+K, H” from within the application.
Now set the parameters below according to your settings (those in bold characters only):
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:0C:29:DE:94:8B
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
PEERDNS=yes
NETMASK=255.255.255.0
IPADDR=192.168.0.100
GATEWAY=192.168.0.1
Save the configuration file and exit the text editor.
To set the nameservers, change directory to /etc and edit resolv.conf.
# cd /etc
# vi resolv.conf
The file format should be like this:
search your-dns-search-path
nameserver dns1-ip-address
nameserver dns2-ip-address
nameserver dns3-ip-address
Now save the configuration file and exit the text editor. To apply changes, we need to bring the network interface down and back up.
# ifdown eth0
# ifup eth0
If you intend to do that remotely, reboot the server instead as you would be disconnected from your server after issuing the “ifdown” command.
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