Network neighborhood detection is done by a passive scan of the server agent's ARP table. This detection has the advantages of not impacting the network traffic, be light on resources, while being always active and real-time. You might however wish to do a more active detection of your local network, notably if this one doesn't have a central server (Active Directory server for example).
Active Scan will try a ping to every possible IPv4 addresses of the local network, thus forcing online machines to communicate with your server. Those communications are then caught by the ARP table passive scan system.
Beware, this scan can be long depending on the local network type (A, B or C), ensure the server will stay online during the entire scan duration. This feature is available since 2.3.5002 version.
Beware, in order for this detection to work, ICMPv4 traffic needs to be authorized by the Firewall:
- On inquirer agent : File and Printer Sharing (Echo Request - ICMPv4-In)
- On neighbors to detect : File and Printer Sharing (Echo Request - ICMPv4-Out)