Setting up a VPN connection and surfing securely in public WLAN networks.
Activation and setup
To use the VPN, you have to activate it once on your Internet-Box and set it up on your device (computer/laptop or smartphone/tablet). Internet-Box 2 and 3 support three connections at the same time. Three VPN users have to be created for this. Only one connection is permitted for each user. Note: Only one VPN connection can be set up with Internet-Box plus. At http://internetbox.home or 192.168.1.1, you will see which product you are using. Please note that you only have access when your home network is connected to your Internet-Box. What details are required for the VPN connection?
As i think there is no workaround to access these other "networks" in the different range... Therefore maybe Wireguard or OpenVPN would suit better for you, because this creates a 10.0.0.1-Address and inside this you are able to use the 192.168.1.X and 192.168.2.X-Nets.