DHCP

DYNAMIC HOST CONFIGURATION PROTOCOL

DHCP IS A PROTOCOL USED TO ASSIGN IP ADDRESS DYNAMICALLY.


DHCP IS USES A LEASE AND POOL OF IP ADDRESS

DHCP USES 4 TYPES OF PACKETS

1 DHCP DISCOVER PACKET:

2 DHCP OFFER:

3 DHCP REQUEST PACKET :

4 DHCP ACK:


CLIENT SERVER

NO IP ADDRESS POOL OF IP (RANGE OF IP ADD)
MAC ADDRESS
1:SEND THE DISCOVER PACKET TO SEARCH THE DHCP SERVER .
2:IF HAVE A VALID DHCP SERVER LOCATED , DHCP SERVER SEND A OFFER PACKET TO THE CLIENT.
(IP ADDRESS/SUBNET MASK+DNS SERVER ADDRESS+DEFAULT GATEWAY+DOMAIN NAME+LEASE)
3:IF DHCP IS NOT FOUND , CLIENT REQUEST FOR APIPA (AUTOMATIC PRIVATE IP ADDRESS) TO OBTAIN AN IP ADDRESS AUTOMATICALLY.
(169.254.0.1-------169.254.255.255)CLASS B
4:CLIENT USESE DHCP REQUEST PACKET TO DHCP IF THE LEASE IS ABOUT TO EXPIRED.
5:DHCP SERVER PROVIDE THE ACKNOWLEDGEMENT PACKET TO CLIENT WITH A NEW LEASE +IP+DNS+DG+DOMAIN.

NOTE: DHCP USES THE PORT NO 67/68 OF UDP