You can configure a list of IP addresses for the ZENworks server that should not be visible to the registration agent:
To restrict an IP addresses:
In ZENworks Control Center, click Devices in the left pane, select Servers in the Devices panel, select a server object, click the Settings tab, click Infrastructure Management, then select Restricted IP Addresses.
Click the address in the Visible IP Addresses list, then click to move that IP address to the Restricted IP Addresses list.
To make a restricted IP address visible to the registration agent:
In ZENworks Control Center, click Devices in the left pane, select Servers in the Devices panel, select a server object, click the Settings tab, click Infrastructure Management, then select Restricted IP Addresses.
Click the address in the Restricted IP Addresses list, then click to move that IP address to the Visible IP Addresses list.