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Creation Code 128 in Visual Studio .NET Lesson 2

Lesson 2
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Managing DHCP in Windows Networks
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If you merely need to modify the range of a current scope, you can achieve this task by changing the address range or exclusion ranges of the subnet s defined DHCP scope.
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Change scope properties with care so as not to exclude active leases, and so as not to include within the reconfigured scope any addresses on the subnet that have been manually assigned to other computers.
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If you need to migrate to a completely new scope, however, you must first add a new scope to the DHCP server and then migrate to that new scope. To perform such a migration, first create and activate the new scope, and then deactivate the old scope. Do not delete the deactivated scope until the clients have migrated to the new scope. To migrate clients, either wait for the clients to automatically renew their leases (after 50 percent of the configured scope lease time has elapsed) or manually renew clients by executing the Ipconfig /release command followed by the Ipconfig /renew com mand on the client computers. Once all clients have been moved or forced to seek leases in another scope, you can safely delete the inactive scope.
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You can enable conflict detection on the Advanced tab of the DHCP server prop erties dialog box. This feature allows you to specify the number of times the DHCP server will ping a given address on the network before assigning that address to a client. If the ping receives a reply, the address will not be assigned. This feature is useful, for example, if you need to deploy a new DHCP server to replace one that has recently failed. In this case, without the aid of an up-to-date DHCP server database, conflict detection can ensure that cur rently active leases are not assigned to other clients.
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Backing Up the DHCP Server Database
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Maintaining a backup of the DHCP database protects you from data loss if the DHCP database is lost (for example, due to hard disk failure) or becomes corrupted. The two backup methods supported by the DHCP server are synchronous (automatic) backups that occur automatically every 60 minutes and asynchronous (manual) backups, performed using the Backup command in the DHCP console. Only manual backups can be used to perform manual database restorations. Automatic backups are used to restore the database only when the DHCP service detects database corruption. When a backup occurs, the entire DHCP database is saved, including the following:
All scopes, including superscopes and multicast scopes Reservations
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7
Configuring DHCP Servers and Clients
Leases All options, including server options, scope options, reservation options, and class options
However, some DHCP data is not saved in any type of backup. For example, creden tials specified for DNS dynamic update are not backed up with a manual or automatic backup. (You can configure these credentials through the Advanced tab of DHCP server properties.)
Performing a Manual Backup
To perform a manual backup of the DHCP database, right-click the DHCP server icon in the DHCP console, and then select Backup. To restore the DHCP database, rightclick the DHCP server icon in the DHCP console, and then select Restore. Backup Locations The default DHCP database manual backup path is \WINDOWS\ System32\Dhcp\Backup. You can change the database backup folder by selecting a different local folder during a manual backup or by changing the backup folder loca tion in the DHCP server properties dialog box. When planning your backup strategy, keep the following in mind:
When you perform manual backups, you don t need to stop the DHCP service unless you re moving your database to a new server. The backup folder location must be a local path.
Migrating a DHCP Server Migrating a DHCP server from one server to another requires you to move the DHCP database to the new server. To move the DHCP database, simply back it up and then restore it to another location, as explained in the fol lowing procedures. To back up the DHCP database (at the source server), complete the following steps: 1. Open the DHCP console. 2. In the console tree, select the applicable DHCP server. 3. From the Action menu, select Backup. The Browse For Folder dialog box opens. 4. Select the folder that will contain the backup DHCP database, and then click OK. You must choose a local drive for the DHCP database backup folder. 5. Stop the DHCP server. This step prevents the server from assigning new address leases to clients after the database has been backed up.
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