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When you create certain objects through BloxOne DDI, it can automatically obtain the next available IPv4 network from a specific address space or subnet. This feature automates the allocation of networks and IP addresses, so you can manage your network space more efficiently. 

BloxOne DDI searches for the next available network or IP address based on the context you define when you create an object. For example, when you create a network within a specific address block, BloxOne DDI searches for the next available network within the specified address block. Similarly, when you create a subnet, BloxOne DDI looks up the next available IP address for that parent address block when you click on the Get next available check box. For information about creating IPv4 networks using the next available feature, see Creating Address Blocks and Creating Subnets

Note

The Get Next Available check box is displayed only when you create a parent address block. After creating the parent address block, the Get Next Available check box is displayed when creating an address block or subnet within the parent address block. 

The following diagram explains the next available network:

Select the Get Next Available check box when creating a subnet within an address block. In this example, subnet A already exists. Selecting the Get Next Available check box creates subnet automatically and assigns the available IP address. There are N number of subnets that can be created automatically depending upon the availability of leases. The maximum number of subnets that can be created (N) is 20.

Guidelines for the Next Available Network 

In a network, BloxOne DDI searches for the next IP address that meets all of the following criteria:

  • It does not match any DNS resource record, such as an A or PTR record, that is associated with an IP address.

  • It is not assigned to a DHCP fixed address or a host address record.
  • It is not part of any DNS bulk host record.
  • It is not within any DHCP range in this network.
  • It is not within an exclusion range.

In a DHCP range, BloxOne DDI searches for the next IP address that meets all of the following criteria:

  • It is not assigned to a fixed address or host record.
  • It does not match any unmanaged IP address.
  • It is not part of an exclusion range within the DHCP range.
  • It is not part of a scheduled task that involves a fixed address.
  • It does not match any active DHCP lease.

Note

When you select the Get Next Available check box, the Tags and DHCP Options are disabled. You cannot assign tags or configure DHCP options when creating networks with the Get Next Available option. You can edit the network once it is created and assign tags or configure DHCP options. The Get Next Available check box is only available when creating an address block or subnet. It is not available while editing an existing address block or subnet. 


Note

BloxOne DDI does not search the Recycle Bin when creating the next available network.


When multiple users simultaneously request for the next available network or IP address, the appliance returns the same unused network or IP address to all users. The user who first saves the task gets the next available network or IP address. In some cases, other users get an error message telling them that the network or IP address is not available when they save their tasks. They can then request another unused network or IP address or enter a new one.

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