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Client reservation is a method of reserving a specific IP address for permanent use by a DHCP client.

In order to reserve an IP address for a computer, verify that the address has not already been leased by the DHCP server to another computer. Reserving an IP address in a scope does not force a computer currently using that address to stop using it.

If the IP address to be reserved is already in use by a computer, first release it by issuing a DHCP release message (DHCPRELEASE). DHCPRELEASE messages can be released by running IPCONFIG/renew command at the command prompt.