2.2.1 DHCP Option Code 43 (Microsoft Vendor-Specific Options)

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DHCP clients and servers supporting NAP use DHCP vendor-specific options for exchanging NAP-specific information through DHCP. These vendor-specific options MUST be sent as vendor-specific extensions as part of DHCP option 43, as specified in [RFC2132] section 8.4.

The Microsoft Encoding Long Options Packet, specified in [MS-DHCPE] section 2.2.9, MUST be used when the cumulative size of all the vendor-specific options being sent in a message exceeds 255 bytes.