Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual page 328

Chapter 21. Dynamic Host Configuration Protocol (DHCP)
fixed-address 172.16.0.20;
}
host example0
The host declaration defines specific parameters for a single system, such as an IP address. To
configure specific parameters for multiple hosts, use multiple host declarations.
Most DHCP clients ignore the name in host declarations, and as such, this name can anything,
as long as it is unique to other host declarations. To configure the same system for multiple
networks, use a different name for each host declaration, otherwise the DHCP daemon fails
to start. Systems are identified by the hardware ethernet option, not the name in the host
declaration.
hardware ethernet 00:1A:6B:6A:2E:0B;
The hardware ethernet option identifies the system. To find this address, run the ifconfig
command on the desired system, and look for the HWaddr address.
fixed-address 10.0.0.20;
The fixed-address option assigns a valid IP address to the system specified by the hardware
ethernet option. This address must be outside the IP address pool specified with the range
option.
If option statements do not end with a semicolon, the DHCP daemon fails to start, and an error such
as the following is logged to /var/log/messages:
/etc/dhcpd.conf line 20: semicolon expected.
dhcpd: }
dhcpd: ^
dhcpd: /etc/dhcpd.conf line 38: unexpected end of file
dhcpd:
dhcpd: ^
dhcpd: Configuration file errors encountered -- exiting
Configuring systems with multiple network interfaces
The following host declarations configure a single system, that has multiple network interfaces, so
that each interface receives the same IP address. This configuration will not work if both network
interfaces are connected to the same network at the same time:
host interface0 {
hardware ethernet 00:1a:6b:6a:2e:0b;
fixed-address 10.0.0.18;
}
host interface1 {
hardware ethernet 00:1A:6B:6A:27:3A;
fixed-address 10.0.0.18;
}
For this example, interface0 is the first network interface, and interface1 is the second
interface. The different hardware ethernet options identify each interface.
If such a system connects to another network, add more host declarations, remembering to:
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