Splitting IPv4 networks - BlueCat Integrity - 26.1.0

Address Manager Administration Guide
ft:locale
en-US
Product name
BlueCat Integrity
Version
26.1.0

With an IPv4 block created in Address Manager, you can split an IPv4 network into sub-networks.

Address Manager includes enhancements to network splitting. IPv4 networks can be split into multiple sub-networks to help you better manage your IP space.
Note:
  • Tags, deployment options, and deployment roles present on a block or network prior to a split are duplicated on the new networks. Child networks prior to a split will be assigned to the corresponding parent.
  • Users must have change, add, or full access rights on IPv4 objects to split IPv4 blocks and networks.

To split an IPv4 network:

  1. Select the IPAM tab in the sidebar, then select IPv4 blocks.
  2. Navigate to the parent block that contains the IPv4 network by selecting the parent block's range in the IPv4 blocks table, or by selecting the parent block in the IPAM tree view panel.
  3. Select the row actions button (⋮) for the network, then select Split.
  4. From the Number of networks drop-down menu, select the desired number of sub-networks.
    Note:
    • The number of networks available for splitting depends on the size of network being split.
    • The selected number of networks determines the network size and IP addresses.
    Note: Splitting larger networks to /31 or /32 will remove associated network, gateway, and broadcast addresses.
  5. Select the Preserve gateway check box to keep the gateway of the original network. If selected, the original network’s gateway will be preserved and used in a split network even if the Use default gateway per network check box is selected. If not selected, the original network’s gateway might be deleted and associated DNS records might also be deleted. If the preserved gateway happens to be the same IP address as the default gateway that's being created in a new network, the preserved gateway will still remain.
  6. UnderAssign addresses, select from the following options:
    Note: The Assign Addresses check box might not be applicable depending on the number of selected networks.
    • Assign custom gateway later—select this option to assign a custom gateway at a later time.
    • Use default gateway per network—select this option to make the first address after the network ID the default gateway. If Preserve gateway is selected above, this option won't apply to the network containing the preserved gateway IP address.
    • Use template—select this option to apply a network template to your networks. From the drop-down menu, select the name of an IPv4 template.
      Note: Address Manager displays the error message “Split not possible” if the preserved gateway and the gateway defined in the template don't match. Change the settings or the network template to continue with the split.
  7. Select Next.
  8. Under Confirm list of networks, set the following as needed:
    • Network name—enter names for the networks. The network name fields will be auto-populated if there's a pre-existing network name.
  9. Select Split network.