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A DHCP lease time specifies the amount of time that the DHCP server grants to a network device the permission to use a particular IP address. There are a number of factors to consider when setting the lease time for IP addresses, such as the types of resources and clients on the network, and impact to traffic and performance.

You can set parameters to control how the DHCP server responds to lease requests for clients and hardware. When you choose to deny the lease requests, the application does not assign IP addresses to the clients and hardware that are defined in the list. You can also configure the DHCP server to assign or deny IP addresses to unknown DHCP clients. Unknown clients include clients that are not roaming hosts and clients that do not have fixed addresses or DHCP host entries.

Hosts are authoritative for their lease data. The BloxOne DDI appliance periodically saves the changes to the leases in the cloud. The application does not support lease history and only current leases are available.

To control how the application assigns leases to client requests:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Global DHCP Configuration.

  2. On the Global DHCP Configuration page, click Leases and enter the following details:

    • Lease Time: Enter the lease time and select the time unit from the drop-down list.

    • Allow Leases for Unknown Clients: Select this check box to assign IP addresses to unknown DHCP clients. Unknown DHCP clients include clients that are not roaming hosts and clients that do not have fixed addresses or DHCP host entries. Clear the check box to deny IP addresses to unknown DHCP clients.

    • Ignore UID when issuing IPv4 DHCP Leases: Select this check box to set the DHCP server to ignore the UID (unique client identifier) of a DHCP client during lease lookups and allocations for a particular subnet. If this setting is enabled, when a DHCP client places a request for a new lease, the DHCP server identifies the DHCP client solely based on the MAC address.

      This feature is applicable only to dynamic leases and does not have any effect on the static lease generated for fixed addresses or roaming hosts.

    • IGNORE LEASE REQUESTS FROM: Click Add to add DHCP clients or hardware whose lease request must be denied. To delete an entry, select the respective check box and click Remove.

  3. Click Save & Close to save the details or click Cancel to exit.

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