2.2.2 DHCPv4 Option Code 43 (0x2B) - Vendor-Specific Information Option

DHCPv4 clients request vendor-specific options from the DHCPv4 server by including option code 43 in the Parameter Request List, as specified in [RFC2132] section 8.4.

DHCPv4 clients implementing this specification MUST also include a vendor-class identifier as described in section 2.2.3 in the DHCPv4. A Validating Server MAY include a vendor-class identifier when authorizing itself using Rogue Detection.

When a DHCPv4 message includes a Vendor Class Identifier with one of the values defined in section 2.2.3, the Vendor-Specific Information Option is defined to use the "Encapsulated vendor-specific options" format specified in [RFC2132] section 8.4. This specification defines the following encapsulated vendor-specific option codes.

Value

Meaning

0x01

Microsoft Disable NetBIOS Option (section 2.2.2.1)

0x02

Microsoft Release DHCP Lease on Shutdown Option (section 2.2.2.2)

0x03

Microsoft Default Router Metric Base Option (section 2.2.2.3)

0x5E

Rogue Detection Request Option (section 2.2.2.4)

0x5F

Rogue Detection Option (section 2.2.2.5)

In addition, DHCPv4 clients that support NAP also use DHCPv4 vendor-specific options for exchanging NAP-specific information. For an overview of NAP and for more information, see [MS-DHCPN] and [TNC-IF-TNCCSPBSoH]. NAP utilizes vendor-specific options as defined in [MS-DHCPN] section 2.2.1.

For information about the format of DHCP Vendor Extensions, see [RFC2132] section 2 and [RFC3315] section 22.