History DHCP was first defined as a standards track protocol in RFC 1531 in October 1993, as an extension to the Bootstrap Protocol (BOOTP). The motivation for extending BOOTP was that BOOTP required manual intervention to add configuration information for each client, and did not provide a mechanism for reclaiming disused IP addresses.

DHCP DHCP (Dynamic Host Configuration Protocol) it is a protocol used to dynamically assign IP address to hosts. DHCP makes it possible for you to access the internet using wireless hotspots at airport or coffee shops It enables clients on a network to obtain IP address and other information from a DHCP server.(DNS,Gateway,Net mask,…)

DHCP DHCP works on Application layer of Internet Protocol Suits. It uses UDP (Connectionless) to exchange IP and Messages to get and release IP address. Client for sending IP request to Server it uses UDP port 67 and for recievieng request from Server it uses UDP port 68.

Exchanging Messages

DHCP Packet Operational code hardware type hardware length hop count Transaction ID Number of second F Unused Client IP address Your IP address Server IP address Gateway IP address Client hardware address (16 bytes) Server name (64 bytes) Boot file name (128 bytes) Options (Variable Length)

Security The base DHCP protocol does not include any mechanism for authentication. Because of this, it is vulnerable to a variety of attacks. These attacks fall into three main categories: – Unauthorized DHCP servers providing false information to clients. – Unauthorized clients gaining access to resources. – Resource exhaustion attacks from malicious DHCP clients.

Advantages & Disadvantages Adv: -Safe and reliable configuration. -Reduced network administration. Disadv: -Increases network traffic (uses broad case to find DHCP server) -Additional time to establish connections (because of time taken to get IP)

How to Install DHCP on a Windows Server 2008

Configure a DHCP on a client

Configure a DHCP on a Client

Thanks. questions?