Exercise 7.1: Configuring an LMHOSTS file

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Exercise 7.1: Configuring an LMHOSTS file

This exercise takes you through the configuration of an LMHOSTS file for a sample network. You then build the LMHOSTS file and verify that the preloaded entries are working.

Consider the diagram in Figure 7.5.

If all that is required is the capability to validate logon requests, which systems need to be configured with an LMHOSTS file? None; there is a Domain Controller on each subnet.

For WKS23, what entries are required in the LMHOSTS file to enable DC1 or DC3 to validate the logon if DC2 is down? The following entries:

199.45.16.37	DC1	#DOM:DORTMUNDER
199.45.16.111	DC3	#DOM:DORTMUNDER

If all systems are required to work with NTS99 and XCHN1, what would be required in the LMHOSTS file? Which systems would need this file? The address of each server with its name would be required. All systems that are not on the same subnet should have these entries added.

To provide WKS11 with all the addresses it requires, what should be in its LMHOSTS file?

The LMHOSTS would look like this:
199.45.16.37 DC1 #DOM:DORTMUNDER
199.45.16.78 DC2 #DOM:DORTMUNDER
199.45.16.111 DC3 #DOM:DORTMUNDER
199.45.16.43 NTS99
199.45.16.101 XCHN1

If the workstations also provided services to the network, what additions would be required in the LMHOSTS file? Each workstation’s IP address and computer name would need to be added.

Assume each domain controller (DC) keeps a central copy of the LMHOSTS file. Write the LMHOSTS file that should now be on WKS45. The file should look like the following.

199.45.16.37 DC1 #PRE #DOM:DORTMUNDER
199.45.16.78 DC2 #PRE #DOM:DORTMUNDER
199.45.16.111 DC3 #PRE #DOM:DORTMUNDER
#INCLUDE \\DC1\public\LMHOSTS
#BEGIN ALTERNATE
#INCLUDE \\DC2\public\LMHOSTS
#INCLUDE \\DC3\public\LMHOSTS
#END ALTERNATE

In the answers for questions 5 and 7, what lines are redundant? Any line that includes a host that exists on the local subnet is redundant.

Using Notepad (or Edit), create the following file:
199.45.16.37 DC1 #PRE #DOM:DORTMUNDER
199.45.16.78 DC2 #PRE #DOM:DORTMUNDER
199.45.16.111 DC3 #PRE #DOM:DORTMUNDER
199.45.16.43 NTS99 #PRE
199.45.16.101 XCHN1 #PRE

10.

Save the file as %winroot%\SYSTEM32\Drivers\ETC\ LMHOSTS. (If one already exists, back it up first so you can return to your original settings.)

11.

From a Command Prompt, enter the command nbtstat -c and note the names that are listed.

12.

Enter the command nbtstat -R and then repeat step 11. The names should change.

Attempt to PING DC1. What happens? There should be a delay and then the name and address appear. The request should time out, or the host will be unreachable.

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