DHCP option 82 feature of the access network

Dynamic Host Configuration Protocol (DHCP) option 82 is the DHCP Relay Agent Information Option field in a DHCP packet, and the ID of this field is 82. When a client sends a DHCP packet containing this field to the DHCP server to request for allocating an IP address, the DHCP server can determine whether the client is valid based on this field, ensuring the user access security.

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