RED_NETADDRESS is the subnet adress on your lan. i.e. on 192.168.200.0/24 the base is 192.168.200.0 and netmask is /24 converted to mask=> 255.255.255.0.
Use an CIDR calculator to get it. IT IS NOT YOUR RED IP, your red ip is RED_ADDRESS.
CIDR and Netmask is the same on different notation:
192.168.200.0/24 = 192.168.200.0 NETMASK 255.255.255.0.
Again use an CIDR calc.
Thanks once again for a great explanation of this!! I will check and report the results soon.
SE