|Securing and Optimizing Linux: RedHat Edition -A Hands on Guide|
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File configurations for each network device you may have or want to add on your system are located in the /etc/sysconfig/network-scripts/ directory with Red Hat Linux 6.1 or 6.2 and are named ifcfg-eth0 for the first interface and ifcfg-eth1 for the second, etc. Following is a example /etc/sysconfig/network-scripts/ifcfg-eth0 file:
DEVICE=eth0 IPADDR=220.127.116.11 NETMASK=255.255.255.0 NETWORK=18.104.22.168 BROADCAST=22.214.171.124 ONBOOT=yes BOOTPROTO=none USERCTL=no
If you want to modify your network address manually, or add a new network on a new interface, edit this file -ifcfg-ethN, or create a new one and make the appropriate changes.
DEVICE=devicename, where devicename is the name of the physical network device.
IPADDR=ipaddr, where ipaddr is the IP address.
NETMASK=netmask, where netmask is the netmask IP value.
NETWORK=network, where network is the network IP address.
BROADCAST=broadcast, where broadcast is the broadcast IP address.
ONBOOT=answer, where answer is yes or no. Do the interface need to be active or inactive at boot time.
BOOTPROTO=proto, where proto is one of the following :
none - No boot-time protocol should be used.
bootp - The bootp now pump protocol should be used.
dhcp - The dhcp protocol should be used.
USERCTL=answer, where answer is one of the following:
yes - Non-root users are allowed to control this device.
no - Only the super-user root is allowed to control this device.