Summary

DHCP has a common message format for all DHCP messages consisting of a fixed DHCP header and a variable portion that contains DHCP options. A DHCP relay agent modifies and forwards DHCP messages between DHCP clients and DHCP servers when they are not located on the same subnet. Common DHCP message exchanges allow a DHCP client to initially obtain a leased IP address configuration, renew it, and automatically obtain a new IP address configuration if it cannot renew the address previously leased. The Windows Server 2008 DHCP Server service on a standalone computer supports an additional message exchange to detect if it is in an Active Directory environment.

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