The document discusses DHCP configuration files. DHCP automatically provides IP addresses and configuration information to hosts on a network. The DHCP server is configured for each subnet and distributes addresses from a range defined in the /etc/dhcpd.conf file. Changes to this file require restarting the dhcp service to take effect.

2. DHCP CONFIGURATION FILE
 Dynamic Host Configuration Protocol (DHCP) is a client/server protocol
that automatically provides IP addresses and other related configuration
information such as subnet Mask and Default Gateway to the hosts
connected to the network.
 This method is efficient and convenient for large networks with many
hosts ,as the process of manually configuring each host is quiet time
consuming.
 By using DHCP one can ensure that every host on your network has valid
IP address ,Subnet Mask,Broadcast Address and Default Gateway.
 DHCP server should be configured for each of the subnet.
 Each host on subnet needs to be configured as DHCP client.
 A dhcpd program is to be installed on server.

3. DHCP CONFIGURATION FILE
 While installing select network servers and install the package.
 The configuration file for DHCP Server is /etc/dhcpd.conf.
Contents of a file:
• #the amount of time in seconds the host can keep the ip address
Default-lease-time 36000
• #domain name of dhcp server
• #name server
Option domain-name “abc.com”
option domain-name-servers 192.168.1.1

4. DHCP CONFIGURATION FILE
• #Gateway/routers
Option routers 1.2.3.4,1.2.3.5
Option routers 192.168.1.1
• #netmask(subnet mask of the network)
Option subnet-mask 255.255.255.0
• #broadcast address
Option broadcast-address 192.168.1.255
• #specify subnet number
Subnet 192.168.1.0 netmask 255.255.255.0

5. DHCP CONFIGURATION FILE
• #define which address can be assigned or used
Range 192.168.1.1 to 192.168.1.126
• If any changes are done in the file then restart dhcp server by using the
command :
Service dhcp restart