Enable or disable the LLTD Responder with Group Policy

Updated: October 14, 2010

Applies To: Windows Server 2008, Windows Server 2008 R2, Windows Server 7

You can use this procedure to enable or disable the Link Layer Topology Discovery (LLTD) Responder component, and to specify the network location types in which it is allowed to run.

The LLTD Responder component is a network component that allows the computer to be discovered by another computer that is running the Network Map feature.

By default, the responder only runs on a network that has a network location type of home or private, but does not run on networks that have a network location type of public or domain. By using Group Policy, you can disable the responder altogether, or change the location types in which it is allowed to run.

Membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure.

  1. Start Group Policy Management Console (GPMC). To do so, click Start, and then in the Start Search box, type gpmc.msc.

  2. In the navigation pane, open the following folders: Local Computer Policy, Computer Configuration, Administrative Templates, Network, and Link-Layer Topology Discovery.

  3. In the details pane, double-click Turn on Responder (RSPNDR) driver.

  4. To disable the responder component completely, click Disabled, and then click OK.

  5. To enable the responder component, click Enabled, and then select one or more of the following:

    • Allow operation while in domain

    • Allow operation while in public network

    • Prohibit operation while in private network

  6. Click OK to save your changes.

  • A version of the LLTP Responder component for Windows XP can be downloaded from the following locations:

  • If you edit policy settings locally on a computer, you will affect the settings on only that one computer. If you configure the settings in a Group Policy object (GPO) hosted in an Active Directory domain, then the settings apply to all computers that are subject to that GPO. For more information about Group Policy in an Active Directory domain, see Group Policy (http://go.microsoft.com/fwlink/?LinkId=55625).

  • A separate component, the LLTD Mapper I/O, runs on the computer that is generating the map and communicates with the computers running the Responder component.

  • You must refresh Group Policy on the computers where you want the new settings to be applied in order for them to take effect. To refresh Group Policy, restart the computer or type the following command at a command prompt, and then press ENTER: gpupdate /force

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