AN Lesson-11

 Troubleshooting DHCP-II

Q.Discuss how to verify the DHCP server configuration for troubleshooting?

Verifying the Server Configuration

• When verifying the DHCP server configuration, you can begin with the DHCP server address. To provide leases for clients on the local subnet, the DHCP server computer must be assigned an address whose network ID is common to that logical subnet.
• In addition, the DHCP Server service must be bound to the connection to that subnet. To verify a DHCP server’s network bindings, select the Advanced tab in server properties and click the Bindings button.

• After you have verified that the DHCP server is properly addressed and bound, verify that the DHCP server is authorized in Active Directory. You can determine that a server is not authorized when a red arrow pointing down marks the server icon in the DHCP console tree. When the server is authorized, the server icon is marked by a green arrow pointing up.

 Verifying the Scope Configuration

• To verify the scope configuration, begin by verifying that the scope is activated. Active and inactive scopes are designated by the same up and down arrows that are used to designate authorized and unauthorized servers.
• For a scope that provides addresses to computers on the local network segment and logical subnet, make sure the network ID of the scope matches that of the DHCP server computer.
• This matter is simple when you are using default subnet masks, but when the local network or scope uses a mask other than /8, /16, or /24, you should use the AND function in Calculator to verify that the server address and scope addresses contain the same network ID.

Reconciling the DHCP Database

 To reconcile the DHCP database, complete the following steps:

1. Open the DHCP console.

2. In the console tree, click the applicable DHCP server.

3. On the Action menu, click Reconcile All Scopes.

4. In the Reconcile All Scopes dialog box, click Verify. Inconsistencies found are reported in the status window.

5. If the database is found to be consistent, click OK. If the database is not consistent, click the displayed addresses that need to be reconciled, and click Reconcile to repair inconsistencies.

To reconcile an individual scope, complete the following steps:

1. Open the DHCP console.

2. In the console tree, click the applicable scope.

3. On the Action menu, click Reconcile.

4. In the Reconcile dialog box, click Verify. Inconsistencies found are reported in the status window.

5. If the scope is found to be consistent, click OK. If the scope is not consistent, select the displayed addresses that need to be reconciled, and click Reconcile to repair inconsistencies.