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Enable or disable the LLTD Mapper I/O 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) Mapper input/output (I/O) component, and to specify the network location types in which it is allowed to run.

The LLTD Mapper I/O is a network component that discovers and communicates with the LLTD Responder component running on other computers on your network. The information discovered by the Mapper I/O allows the Network Map feature to create a graphic diagram that depicts the devices and connections on your local subnet.

By default, the Mapper I/O component only runs on networks that have a location type of home or private, and does not run on networks that have a location type of public or domain. By using Group Policy you can disable the Mapper I/O component, 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. Open Group Policy Management Editor. To do so, click Start, and then in the Start Search box, type mmc gpedit.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 Mapper I/O (LLTDIO) driver.

  4. To disable the Mapper I/O component, click Disabled, and then click OK.

  5. To enable the Mapper I/O 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.

  • 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).

  • You must also enable the LLTD Responder component on any computers that you want to appear on your Network Map.

  • 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

See Also

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