2.2.2.1 Vendor-Specific Option Code 0x01 - Microsoft Disable NetBIOS Option

This option is sent by a DHCPv4 server to a DHCPv4 client in a DHCPOFFER or a DHCPACK message.<2> It has no effect on subsequent options in that message or on the DHCPREQUEST message sent by the client to the server.

This option can be used to enable or disable the use of NetBIOS over TCP/IP on the network interface for which the DHCPv4 message was received. DHCPv4 clients SHOULD<3> support this option. If the use of NetBIOS over TCP/IP is disabled on the interface, no NetBIOS over TCP/IP packets can be sent from or received on that interface. If any NetBIOS over TCP/IP packets are sent to the client on that interface, they are silently discarded. This option has no effect on NetBIOS over NetBEUI.


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Vendor-specific Option Code

Vendor-specific Option Length

Vendor-specific Option Data

...

Vendor-specific Option Code (1 byte): This MUST be 0x01.

Vendor-specific Option Length (1 byte): This MUST be 0x04.

Vendor-specific Option Data (4 bytes): Values are as follows.

Value

Meaning

0x00000000

Enables NetBIOS over TCP/IP (Default Value) for that network interface.

0x00000001

Ignored (existing behavior unchanged).

0x00000002

Disables NetBIOS over TCP/IP for that network interface.

0x00000003 — 0xFFFFFFFF

Ignored (existing behavior unchanged).

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