Address Range Management

You use the DNS/DHCP Management Utility to create and set up Subnet Address Range objects for each pool of addresses you want to be dynamically assigned by DHCP. Optionally, the Address Range object stores the start of a hostname that can be assigned to clients when addresses are assigned.

The Address Range Management role consists of the following tasks:

• Creating a Subnet Address Range Object
• Viewing or Modifying a Subnet Address Range Object
• Deleting a Subnet Address Range Object

Creating a Subnet Address Range Object

1. Click DHCP Management > Address Range Management to open the Address Range Management window in the main panel.

2. Select Create Address Range from the drop-down menu and click OK to open the Create Subnet Address Range window.

3. Select the subnet within which the address range is to be created.

4. In the Address Range Name field, type the name of the subnet address range.

5. Click Add and then select the subnet address range from the list of address ranges displayed in the Subnet Address Range window. This automatically fills the Start Address and End Address fields that specify the lower and upper limits of the range.

6. Click Create.

   A message indicates that the new subnet address range has been created.

Viewing or Modifying a Subnet Address Range Object

1. Click DHCP Management > Address Range Management to open the Address Range Management window in the main panel.

2. Select View/Modify Address Range from the drop-down menu and click OK to open the View/Modify Subnet Address Range window.

3. From the Select Subnet drop-down menu, select the subnet that contains the address range to be modified.

4. From the Select Address Range drop-down menu, select the address range to be modified.

5. Click OK.

   You are led through a set of steps by which you can modify the following address range parameters:

   • Range Type: indicates the range of addresses used by the DHCP server in response to requests from clients.

     From the Select Range Type drop-down menu, choose one of the following:

     • Dynamic DHCP: A range of addresses used by the DHCP server to assign addresses to clients making only DHCP requests. If the Dynamic DHCP range type is assigned, the DNS Update Option parameter can be enabled. If Always Update is selected, the DHCP server will update DNS as dynamic addresses are assigned and released.
     • Dynamic BOOTP: A range of addresses used by the DHCP server to assign addresses to clients making only BOOTP requests.
     • Dynamic BOOTP and DHCP: A range of addresses used by the DHCP server to assign addresses to clients making either DHCP or BOOTP requests. If the Dynamic BOOTP and DHCP range type is assigned, the DNS Update Option parameter can be enabled. If Always Update is selected, the DHCP server will update DNS as dynamic addresses are assigned and released.
     • Dynamic DHCP with Automatic Host Name Generation: A range of addresses used by the DHCP server to assign addresses to clients making only DHCP requests. Hostnames for this pool will be generated and entered into the DNS system. Hostnames are provided to clients as a DHCP option. If you choose this option, ensure that you create the corresponding IN-ADDR.ARPA zone.
     • Excluded: A range of addresses that is excluded by the DHCP server while assigning IP addresses.

     If the Dynamic DHCP with Automatic Host Name Generation range type is assigned, the Auto Host Name Starts With parameter can be set. This parameter appends a unique integer to the hostname, generating a unique hostname for each client.

     Additionally, the name of the DHCP Server can be specified by selecting it from the DHCP Server drop-down menu.

   • Comments: Type your comments about the Subnet Address Range in this box. This is an optional parameter.

Deleting a Subnet Address Range Object

1. Click DHCP Management > Address Range Management to open the Address Range Management window in the main panel.

2. Select Delete Address Range from the drop-down menu and click OK to open the Delete Subnet Address Range window.

   • Select the subnet that contains the address range.
   • To delete all the address ranges in the subnet, check the top-level check box and click Delete.
   • To delete one or more Address Range objects, check the check box next to it and click Delete.