Principles of the DHCP option 82 feature

When a Dynamic Host Configuration Protocol (DHCP) client sends a request packet to the DHCP server through the DHCP relay, the DHCP relay adds option 82 to this packet. After receiving the DHCP request packet forwarded by the DHCP relay agent, the DHCP server records the information carried by option 82 of the packet, and then sends the packet that carries the DHCP configuration and option 82 back to the DHCP relay agent. After receiving the packet returned from the DHCP server, the DHCP relay forwards the processed packet to the client.
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