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Dynamic Host Protocol

What Is ItWhat Is It A protocol for assigning dynamic IP addresses to

devices on a network

Devices can be workstations, servers, routers, printers

A device can have a different IP address every time it connects to the network

It supports a mix of static and dynamic IP addresses e.g. Web server needs a static IP address

Why Use ItWhy Use It

The Growing size of Networks

Requires Less Human Interaction

Less Prone To Error

Portability

Who Uses ItWho Uses It

Internet Service Providers

Universities

Large Corporations and Organizations

Anyone who has to deal with a large range of Internet Addresses

DHCP ServerDHCP Server

Server which issues IP addresses to devices when they connect to the network

Configuration file

- This contains a range of options to send to the client machine

DHCP Server Configuration FileDHCP Server Configuration File

subnet 192.168.1.0 netmask 255.255.255.0 { # The range of IP addresses the server# will issue to DHCP enabled PC clients# booting up on the network range 192.168.1.201 192.168.1.220; # Set the amount of time in seconds that# a client may keep the IP address

default-lease-time 86400;max-lease-time 86400;

 

DHCP Server DHCP Server Configuration FileConfiguration File

# Set the default gateway to be used by# the PC clients option routers 192.168.1.1;

 # Don't forward DHCP requests from this# NIC interface to any other NIC# interfaces option ip-forwarding off; # Set the broadcast address and subnet mask # to be used by the DHCP clients

option broadcast-address 192.168.1.255;option subnet-mask 255.255.255.0;

 

DHCP Server Configuration FileDHCP Server Configuration File

Set the DNS server to be used by the # DHCP clients

option domain-name-servers 192.168.1.100; # Set the NTP server to be used by the # DHCP clients option nntp-server 192.168.1.100;  # If you specify a WINS server for your Windows clients, # you need to include the following option in the dhcpd.conf file:

option netbios-name-servers 192.168.1.100;

}

DHCP Server Configuration FileDHCP Server Configuration File

host MEC-1 {

hardware ethernet 08:00:2b:4c:59:23;fixed-address 192.168.1.222;

}

DHCP ClientDHCP Client

Broadcasts DHCPDISCOVER request on the network

Listening DHCP Server issues a DHCPOFFER response

The server then assigns an IP address to that DHCP client machine