DHCP installation and Configuration on RHEL5/CentOS

1. Install dhcp server

yum –y install dhcp

2. Copy the sample configuration file to /etc

cp -v /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf

3. Edit the dhcp configuration file /etc/dhcpd.conf as our network details. Also  do the following

#       range dynamic-bootp 192.168.0.128 192.168.0.254; (comment this line and add as below)
        range 192.168.1.150 192.168.1.200;
note: If we dont want specific ip assignments for the hosts (reservation), comment that lines.

4. Start dhcp server

service dhcpd start
chkconfig dhcpd on

5. If we want to configure reservations for a system do as following in the /etc/dhcpd.conf file

host xp1 {
         hardware ethernet 00:0C:29:0C:55:83;
         fixed-address 192.168.1.170;
}
note : Optional 'option-*' are supported between host { } block

6. Restart the service to make the changes to effect

service dhcpd restart

7. Done!!

Notes:
1. On client system /var/lib/dhclient/dhclient-eth0.leases file contains dhcp lease information. On server /var/lib/dhcpd/dhcpd.leases contains the lease information for all clients.
2. NTP details can be given outside the subnet options to make globally available. For more information use ‘man dhcpd.conf’ command.