<p>NetBIOS or Network Basic Input/Output System that was created in the early 1980s is still alive and is used on many networks today. NetBIOS is used for name resolution when DNS is not available. Because of many security concerns, it is strongly recommended to disable the NetBIOS service in your network. Disabling NetBIOS service greatly mitigates attackers&#8217; ability to poison and spoof responses, obtain user&#8217;s hashed credentials, etc.</p>
<p>If you are using a DHCP service/server(s) in your environment it is advisable to disable the NetBIOS for DHCP clients.</p>
<h5>Here&#8217;s how to disable NetBIOS for DHCP clients.</h5>
<p>Connect to your DHCP server and navigate to desired DHCP scope (you&#8217;ll have to do this on each DHCP scope)</p>
<p>In the left pane, <strong>expand the DHCP scope</strong> and <strong>right-click on the Scope Options</strong> and select <strong>Configure Options</strong>.</p>
<p><img class="alignnone wp-image-3856 size-full" title="How to disable NetBIOS for DHCP clients" src="https://www.wincert.net/wp-content/uploads/2020/08/disable-netbios-dhcp-1.png" alt="How to disable NetBIOS for DHCP clients" width="318" height="156" /></p>
<p>Now click on the <strong>Advanced tab</strong> and from the <strong>Vendor Class</strong> drop-down list select <strong>Microsoft Options</strong>.</p>
<p>Check the 0<strong>01 Microsoft Disable NetBIOS Option</strong> checkbox and in the <strong>Data entry</strong> <em><strong>Long</strong></em>: box type the value <strong>0x2</strong>.</p>
<p><img class="alignnone wp-image-3857 size-full" title="How to disable NetBIOS for DHCP clients" src="https://www.wincert.net/wp-content/uploads/2020/08/disable-netbios-dhcp-2.png" alt="How to disable NetBIOS for DHCP clients" width="392" height="265" /></p>
<p>Click <strong>OK</strong>.</p>
<p>If you want this change to be active immediately, please open <strong>Command Prompt</strong> on the client machine and type the <strong>ipconfig /renew</strong> command to renew the <strong>DHCP client lease</strong>. Otherwise, it will be done automatically once the client renews its lease.</p>
<p>Hope this helps.</p>

How to disable NetBIOS for DHCP clients
