Resize DHCPv4 ranges to make them larger or smaller.
When you resize a range, you can select how Address Manager handles DHCPv4
addresses that no longer fit in the range.
Note: If you resize a DHCPv4 range that
contains abandoned IPv4 addresses, the state of the abandoned IPv4 addresses will be
changed to static. For more information on abandoned IPv4 addresses, refer to Managing abandoned IPv4 addresses.
To resize a DHCPv4 range:
- Select the IPAM tab in the sidebar, then select IPv4 blocks.
- Navigate to the IPv4 network that contains the DHCPv4 range you want to resize by selecting the network's range in the IPv4 blocks and networks table, or by selecting the network in the IPAM tree view panel.
- Select the IPv4 DHCP ranges tab.
- Select the row actions button (⋮) for the IPv4 DHCP range you want to resize, then select Resize.
-
Under DHCP range information, set the following parameters:
- Split DHCP range around static, reserved and gateway addresses—select the checkbox to automatically split the DHCP range at any static or reserved addresses that may be in the network and within the DHCP range. Upon deployment, Address Manager automatically creates multiple DHCP pools on the managed server, leaving any static addresses outside of the DHCP range you specify. When not selected, any static or reserved addresses within the DHCP range become part of the DHCP range.
- Resize DHCP range using—select from the following
options:
- IP addresses—enter the Start address and End address of the IPv4 DHCP range.
- Offsets—enter the offsets from the start and end of the network that mark the boundaries of the DHCP range.
- Offset and percentage—select Start offset to offset the start of the DHCP range from the start of the network. Select End offset to offset the start if the DHCP range from the end of the network. After selecting the offset type, enter a percentage value indicating the percentage of the parent network that will be included in the DHCP range (the DHCP range size), starting at the offset.
- On the DHCP exclusion range tab, enter the start address and the end address of the range that you wish to exclude in the Start IPv4 address and End IPv4 address fields, then select Add to exclusion range. To exclude a single address, enter the same address in the Start IPv4 address and End IPv4 address fields.
-
On the Pool resize options tab, select an option to
determine how Address Manager handles any DHCP allocated addresses that
are no longer part of the resized range. When you reduce the size of a DHCP
range, it is possible for DHCP allocated addresses to be orphaned or left out of
the smaller range. You can convert orphaned addresses to DHCP reserved, static,
or unassigned addresses.
- DHCP reserved hosts—when selected, Address Manager converts orphaned addresses to DHCP reserved addresses.
- Static hosts—when selected, Address Manager converts orphaned addresses to static addresses.
- Unassigned hosts—when selected, Address Manager converts orphaned addresses to unassigned addresses.
- On the Change control tab, add a change control comment, if required.
- Select Confirm.