DHCP (DYNAMIC HOST CONFIGURATION PROTOCOL)

By

Lalit Bhati

HCL cdc Gr.Noida

lkumar008@gmail.com

OUTLINE

What is DHCP Purpose of DHCP Configuration of DHCP How DHCP works on a network Lease Renewal in DHCP Planning for DHCP

WHAT IS DHCP

Dynamic Host Control Protocol (DHCP) is a method for automating the assignment of IP addresses and other networking information. It is used on campus in residence halls and libraries, as well as over the wireless network.

In other words DHCP Automatically assigns IP addresses and tcp/ip setting to devices on a network

PURPOSE OF DHCP

The overall purpose of the DHCP server is to reduce the workload and error margins, which can occur in assigning the IP addresses manually.

When a computer uses a static IP address there can be the chances of error and conflict when two computers use the same IP address. By using the DHCP server there are no chances of such kind of conflicts and errors.

CONFIGURATION OF DHCP

Installing the DHCP server is made quite easy in Windows 2003. By using the "Manage your server" wizard, you are able to enter the details you require and have the wizard set the basics for you. Open to "Manage your server" wizard, select the DHCP server option for the list of server roles and press Next.You will be asked to enter the name and description of your scope.

Scope: A scope is a collection of IP addresses for computers on a subnet that use DHCP.

HOW DHCP WORKS ON A NETWORK

Discover

Offer

Acknowledgement

Request

Server Client

1. Client sends Discover “Someone send me an address”. This is a broadcast.2. Servers Offer “Use this address”.3. Client Requests “I’ll use this one”. (broadcast)4. Servers Acknowledge “OK or No Way!” (ACK/NAK)

LEASE RENEWAL IN DHCP

Halfway through lease period, client asks its current server to continue using the address.Client sends Request (uncast). Server sends Acknowledgement.

If current server isn’t available, client will broadcast request. This may cause it to change servers.

If lease expires, client must stop using the address and start the process from scratch

PLANNING FOR DHCP

Preparation for DHCP requires careful planning

IP addressing strategy Consider current needs Allow for growth

Network architect configures rules for addressing strategy into DHCP server

THANK YOU