How to disable NetBIOS using the SonicWall DHCP Server
You can disable NetBIOS name resolution on a Windows 2000/XP/Vista computer using two methods.
The first method involves disabling NetBIOS over TCP/IP using the network connections control panel configuration as shown below.
The second method involves configuring DHCP option 43 within the SonicWall DHCP Server scope. First, set the NetBIOS over TCP/IP option on the computer to Default as shown below.
Next, create a DHCP Options Object within the SonicWall as shown below.
On SonicOS 6.5 and newer firmware the OptionsObject has been moved to the Advanced tab as seen below:
Then add this new DHCP Options Object to the exisisting DHCP Server scope as shown below.
DHCP option 43 is for Vendor Specific Information. It is defined in RFC 2132. When these specific hex values are contained in DHCP option 43, a Windows 2000/XP/Vista computer will disable NetBIOS over TCP/IP name resolutuion.