Date post: | 19-Dec-2015 |
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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
How to Install DHCP on a Windows Server 2008
Configure a DHCP on a client
Configure a DHCP on a Client
Thanks .
questions?