Host Configuration - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

dhcpd: Not configured to listen on any interfaces!
option subnet-mask 255.255.255.0;
The option subnet-mask option defines a subnet mask, and overrides the netmask value in
the subnet declaration. In simple cases, the subnet and netmask values are the same.
option routers 10.0.0.1;
The option routers option defines the default gateway for the subnet. This is required for
systems to reach internal networks on a different subnet, as well as external networks.
range 10.0.0.5 10.0.0.15;
The range option specifies the pool of available IP addresses. Systems are assigned an address
from the range of specified IP addresses.
For further information, refer to the dhcpd.conf(5) man page.
Alias Interfaces
Alias interfaces are not supported by DHCP. If an alias interface is the only interface, in
the only subnet specified in /etc/dhcpd.conf, the DHCP daemon fails to start.

21.4.1. Host Configuration

Before making any changes, back up the existing /etc/sysconfig/dhcpd and /etc/dhcpd.conf
files.
Configuring a single system for multiple networks
The following /etc/dhcpd.conf example creates two subnets, and configures an IP address for the
same system, depending on which network it connects to:
ddns-update-style interim;
default-lease-time 600;
max-lease-time 7200;
subnet 10.0.0.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option routers 10.0.0.1;
range 10.0.0.5 10.0.0.15;
}
subnet 172.16.0.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option routers 172.16.0.1;
range 172.16.0.5 172.16.0.15;
}
host example0 {
hardware ethernet 00:1A:6B:6A:2E:0B;
fixed-address 10.0.0.20;
}
host example1 {
hardware ethernet 00:1A:6B:6A:2E:0B;
Host Configuration
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