June 7, 2012

RHEL/Centos sysconfig network scripts

The /etc/sysconfig/network-scripts/ifcfg-ethN files

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:

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 :

    1. none - No boot-time protocol should be used.
    2. bootp - The bootp now pump protocol should be used.
    3. dhcp - The dhcp protocol should be used.
  • USERCTL=answer, where answer is one of the following:

    1. yes - Non-root users are allowed to control this device.
    2. no - Only the super-user root is allowed to control this device.  

      NM_CONTROLLED="no"/"yes" : Whether Network-Manager controlled


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