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History DHCP was first defined as a standards track protocol in RFC 1531 in October 1993, as an...

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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
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Page 1: 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.

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.

Page 2: 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.

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,…)

Page 3: 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.

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.

Page 4: 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.

Exchanging Messages

Page 5: 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.
Page 6: 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.

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)

Page 7: 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.

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.

Page 8: 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.

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)

Page 9: 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.

How to Install DHCP on a Windows Server 2008

Page 10: 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.

How to Install DHCP on a Windows Server 2008

Page 11: 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.

Configure a DHCP on a client

Page 12: 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.

Configure a DHCP on a Client

Page 13: 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.

Thanks .

questions?


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