Dynamic Host Configuration Protocol (DHCP) is a client/server protocol helps to assign ip address automatically and dynamically to client machine.In this post we will learn how to install and configure DHCP server in RHEL 5.

Note: DHCP runs on UDP port 67 for the DHCP serve and UDP port 68 for the DHCP client machines.

Steps to install and configure DHCP server

(1) Install DHCP Package :

yum install dhcpd (in Redhat based OS)

(2) Edit file /etc/dhcpd.conf:

vi /etc/dhcpd.conf

(3) Configure /etc/dhcpd.conf file:

Paste given below contents in /etc/dhcpd.conf file and save it

ddns-update-style interim;
ignore client-updates;

subnet 10.1.1.0 netmask 255.255.255.0 {
range 10.1.1.66 10.1.1.199;

# --- default gateway
option routers 10.1.1.1;
option subnet-mask 255.255.255.0;
option ip-forwarding off;
#option nis-domain "domain.org";
#option domain-name "domain.org";
option domain-name-servers 222.x.x.x, 222.y.y.y;
option broadcast-address 10.255.255.255;
#option time-offset 39600; # Eastern Standard Time

#option netbios-name-servers 10.1.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
option netbios-node-type 8;

default-lease-time 1209600;
max-lease-time 1209600;

}

(4) Then restart the dhcpd service:

service dhcpd restart