Adding or modifying a subnet option set

To add or modify a subnet definition using the DHCP Server Manager:

1. Select View Subnets.

2. Select Entry Add or highlight the subnet you want to change and select Entry Modify.

3. Enter the subnet's IP address in dot notation, the subnet mask, the address pool assigned to the subnet and an optional description. (You cannot change an existing subnet address.)

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   NOTE: To define or modify an address pool, click on Address pools to invoke the Address Allocation Manager.

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4. Click on Lease to enter the default lease parameters:

   
   Default lease time

   To set an infinite default lease, click on Unlimited. Otherwise, click on Limited and enter the lease in days, hours and minutes. The lease must be greater than 0, and less than or equal to 49,674 days (approximately 136 years).

   
   Maximum lease time

   To set an infinite maximum lease, click on Unlimited. Otherwise, click on Limited and enter the maximum lease in days, hours and minutes. The lease must be greater than 0, and less than or equal to 49,674 days.

   
   Renewal on (percent)

   Enter the lease renewal time as a percentage of the lease. The default value is 75% of the lease, suggesting the client request a renewal when the lease is three-quarters over.

   
   Rebind on (percent)

   Enter the lease rebind time as a percentage of the lease. The rebind time defines when a client makes a second attempt to renew its lease if the first attempt failed. The default is 90% of the lease, suggesting the client make a second attempt to renew the lease when 10% of the lease remains.

5. To configure DHCP options that are specific to the subnet you are adding, click on Generic. See ``Configuring DHCP options'' for more information.

6. Click on OK.