32.5. Viewing and Deleting Leases

Every time the DHCP server supplies a dynamic address to a client, it records information about the assignment in its lease file. Fixed addresses assigned to specific hosts (covered in Section 32.8 “Adding and Editing Shared Networks”) do not trigger the creation of a lease, as they are considered permanent. You can use this module to view all current leases or expired leases, and to delete those that exist. Removing a lease tells the server that its IP address is no longer in use and can be assigned to some other client. This should only be done if the client really isn't using the address any more, for example, if it crashed while holding a long lease.

To view and delete leases, follow these steps:

1.
On the module's main page, click on the List Active Leases button. This will display a table listing all currently active leases, with the IP address, client name, and start time shown for each.

2.
To show leases that have expired as well, click on the List all active and expired leases button at the bottom of the page.

3.
To remove a lease, click on its IP address in the list. The DHCP server will be stopped and restarted automatically to make the deletion active.

It is also possible to view the leases to clients in just a single subnet by clicking on the List Leases button on the subnet editing form. This can be useful if you have several networks connected to your system with a large number of clients and want to limit the size of the lease display.

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