www.zyxel.com
Test the Result
Download Nmap free security scanner for testing the result:
https://nmap.org/download.html
Open the Nmap GUI, set the Target to be the WAN IP of ZyWALL/USG
(172.124.163.150 in this example) and set Profile to be Intense Scan. Click Scan.
Go to the ZyWALL/USG Monitor > Log, you will see [warn] log message such as
below.
Monitor > Log
542/749