Resize IPv6 blocks and networks in either the Unique Local Address Space or the Global Unicast Address Space to make them larger or smaller.
Note: Users must have change, add, or full access rights on IPv6 objects to split or resize IPv6 blocks.
- You cannot resize a block to a CIDR lower than /126.
- The maximum allowed network size is /64.
- The new object cannot exceed the address space or be of the same size as its parent block.
- The resized object must contain some of its previous address space.
- Blocks and networks cannot be resized to non-CIDR boundaries.
- If a child object is no longer covered by the range of the resized object, the child object becomes a sibling object to the newly resized object. The child object must be completely covered or uncovered by the newly resized object or you will receive an error.
- If an adjacent block is completely covered by a resized block, a confirmation page opens and you need to confirm that you want the adjacent block to become a child of the resized block. The adjacent block must either be entirely covered or not covered by the resized block.
To resize an IPv6 block or network:
- Select the IP Space tab. Tabs remember the page you last worked on, so select the tab again to ensure you're on the Configuration information page.
- From the configuration drop-down menu, select a configuration.
- Click the IPv6 tab. In the IPv6 Blocks section, click the FC00::/6 or the 2003::/3 address space.
- Under Address Space, select the block or network that you want to resize.
- Click the menu beside the block/network name and select Resize.
Under Resize Range, enter the block or network size
or the starting IPv6 address with the block or network size for resizing the
- Prefix Size—select this option to specify the block or network size using CIDR notation. Enter the block or network size. For example, 64.
- Starting Address—select this option to
specify the block or network size with the starting IPv6 address. Enter
the IPv6 address in the Starting Address field.
For example, 2001:DB8::.
- Size—enter the size of the block or network using CIDR notation. For example, 64. You do not need to enter a forward slash (/).
Note: If the block being resized covers adjacent blocks or if it contains child objects (such as blocks or networks), a Change Control section appears in the Resize IPv6 Block/Network Confirmation page to alert you of the following:
- If you are resizing the block into a larger block, adjacent blocks will be included in the resized block.
- If you are resizing the block into a smaller block, child objects will be excluded from the resized block.
- Under Change Control, add comments, if required.
- Click Confirm.