Red Hat/Centos network interface configuration files syntax

	The Network Administration Tool (redhat-config-network) is an easy way to make changes to the various network interface configuration files (refer to the chapter titled Network Configuration in the Red Hat Enterprise Linux System Administration Guide for detailed instructions on using this tool).
 
However, it is also possible to edit the configuration files for a given network interface manually.
 
Below is a listing of the configurable parameters in an Ethernet interface configuration file:
 
    BOOTPROTO=<protocol>, where <protocol> is one of the following:
 
        none — No boot-time protocol should be used.
 
        bootp — The BOOTP protocol should be used.
 
        dhcp — The DHCP protocol should be used. 
 
    BROADCAST=<address>, where <address> is the broadcast address. This directive is deprecated.
 
    DEVICE=<name>, where <name> is the name of the physical device (except for dynamically-allocated PPP devices where it is the logical name).
 
    DHCP_HOSTNAME — Only use this option if the DHCP server requires the client to specify a hostname before receiving an IP address. (The DHCP server daemon in Red Hat Enterprise Linux does not support this feature.)
 
    DNS{1,2}=<address>, where <address> is a name server address to be placed in /etc/resolv.conf if the PEERDNS directive is set to yes.
 
    HWADDR=<MAC-address>, where <MAC-address> is the hardware address of the Ethernet device in the form AA:BB:CC:DD:EE:FF. This directive is useful for machines with multiple NICs to ensure that the interfaces are assigned the correct device names regardless of the configured load order for each NIC's module. This directive should not be used in conjunction with MACADDR.
 
    IPADDR=<address>, where <address> is the IP address.
 
    MACADDR=<MAC-address>, where <MAC-address> is the hardware address of the Ethernet device in the form AA:BB:CC:DD:EE:FF. This directive is used to assign a MAC address to an interface, overriding the one assigned to the physical NIC. This directive should not be used in conjunction with HWADDR.
 
    MASTER=<bond-interface>,where <bond-interface> is the channel bonding interface to which the interface the Ethernet interface is linked.
 
    This directive is used in conjunction with the SLAVE directive.
 
    Refer to Section 8.2.3 Channel Bonding Interfaces for more about channel bonding interfaces.
 
    NETMASK=<mask>, where <mask> is the netmask value.
 
    NETWORK=<address>, where <address> is the network address. This directive is deprecated.
 
    ONBOOT=<answer>, where <answer> is one of the following:
 
        yes — This device should be activated at boot-time.
 
        no — This device should not be activated at boot-time. 
 
    PEERDNS=<answer>, where <answer> is one of the following:
 
        yes — Modify /etc/resolv.conf if the DNS directive is set. If using DHCP, then yes is the default.
 
        no — Do not modify /etc/resolv.conf. 
 
    SLAVE=<bond-interface>,where <bond-interface> is one of the following:
 
        yes — This device is controlled by the channel bonding interface specified in the MASTER directive.
 
        no — This device is not controlled by the channel bonding interface specified in the MASTER directive. 
 
    This directive is used in conjunction with the MASTER directive.
 
    Refer to Section 8.2.3 Channel Bonding Interfaces for more about channel bond interfaces.
 
    SRCADDR=<address>, where <address> is the specified source IP address for outgoing packets.
 
    USERCTL=<answer>, where <answer> is one of the following:
 
        yes — Non-root users are allowed to control this device.
 
        no — Non-root users are not allowed to control this device.