this is the IP range you RED zone will get it’s IP to access the internet.
No other zone can use this IP range.
So Green can be 192.168.20.1
Blue can be 192.168.33.1
DMZ can be 192.168.77.1
you need to have a different number were the “x” is in this example
192.168.x.1
you need to run “setup” at the console.