Enable Domain Discovery

In case you would like to enable LLTD and RSPNDR (the services need to enable Domain Discovery on Vista and Server 2008) throughout the domain through Windows Server 2008 here are the steps:

1. Start Group Policy Management Console (GPMC). To do so Click Start, click Run, and then type gpmc.msc.
2. In the navigation Pane, open the following folders:
a. Forest
b. Domain
c. {Select the Domain that you would like to apply this policy to}
d. Group Policy Objects
e. Default Domain Policy
f. Computer Configuration
g. Policies
h. Administrative Templates
i. Network
j. Link-Layer Topology Discovery
3. In the details pane, double-click Turn on Mapper I/O (LLTDIO) Driver
a. To enable the responder component, click Enabled, and then select one or more of the following:
i. Allow operation while in domain
ii. Allow operation while in public network
iii. Prohibit operation while in private network
b. To disable the responder completely, click Disabled, and then click OK.
4. If you want to turn on the Responder Driver, in the details pane, double click Turn on Responder (RSPNDR) Driver.
a. To enable the responder component, click Enabled, and then select one or more of the following:
i. Allow operation while in domain
ii. Allow operation while in public network
iii. Prohibit operation while in private network
b. To disable the responder completely, click Disabled, and then click OK.

FROM: http://x220.minasi.com/forum/topic.asp?TOPIC_ID=24459