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Dynamic Host Configuration Protocol (DHCP)

The Dynamic Host Configuration Protocol (DHCP) is a network service that enables host computers
to be automatically assigned settings from a server as opposed to manually configuring each network
host. Computers configured to be DHCP clients have no control over the settings they receive from
the DHCP server, and the configuration is transparent to the computer's user.
The most common settings provided by a DHCP server to DHCP clients include:
• IP-Address and Netmask
• DNS
• WINS
However, a DHCP server can also supply configuration properties such as:
•
 Host Name
•
 Domain Name
•
 Default Gateway
•
 Time Server
•
 Print Server
The advantage of using DHCP is that changes to the network, for example a change in the address of
the DNS server, need only be changed at the DHCP server, and all network hosts will be reconfigured
the next time their DHCP clients poll the DHCP server. As an added advantage, it is also easier to
integrate new computers into the network, as there is no need to check for the availability of an IP
address. Conflicts in IP address allocation are also reduced.
A DHCP server can provide configuration settings using two methods:
MAC Address
This method entails using DHCP to identify the unique hardware address of each network card
connected to the network and then continually supplying a constant configuration each time the
DHCP client makes a request to the DHCP server using that network device.
Address Pool
This method entails defining a pool (sometimes also called a range or scope) of IP addresses from
which DHCP clients are supplied their configuration properties dynamically and on a "first come,
first served" basis. When a DHCP client is no longer on the network for a specified period, the
configuration is expired and released back to the address pool for use by other DHCP Clients.
Ubuntu is shipped with both DHCP server and client. The server is dhcpd (dynamic host
configuration protocol daemon). The client provided with Ubuntu is dhclient and should be installed
on all computers required to be automatically configured. Both programs are easy to install and
configure and will be automatically started at system boot.
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