Click the Manage & Monitor tab and click Organization VDCs in the left pane.

Double-click the organization virtual datacenter name to open the organization virtual datacenter.

Click the Edge Gateways tab, right-click the edge gateway name, and select Properties.

Click the Sub-Allocate IP Pools tab.

Select an external network and IP pool to suballocate.

(Optional) Type an IP address or range of IP addresses within the IP pool range and click Add to add a suballocated IP pool.

(Optional) Select a suballocated IP pool and click Modify to modify the IP address range of the suballocated IP pool.

(Optional) Select a suballocated IP pool and click Remove to remove the suballocated IP pool.

Click OK.