What Is Dhcp Option 82?
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DHCP Option 82 (also known as DHCP Relay Agent Information Option) is an extension to the DHCP protocol that allows a DHCP server to identify the source point from which a DHCP request originated. This option carries the packet from the remote access server or other relay agent to the DHCP server and contains information about the forwarding agent, such as the port number, IP address and VLAN number of the interface used by the client. This additional information provided by the DHCP Relay Agent can be used to limit DHCP services to certain clients or to apply unique policies to different types of clients.