Hi @1118,
welcome to NethServer Community.
Both attachements are possible to access it from internal and external. You may use port forwarding on your router to put the cams to the 192.168.0.0 network. You have to do it on Nethserver too, when the cams are in green network. This way you can reach your cams by port, like https://public-ip-or-fqdn:22221 for the first cam, https://public-ip-or-fqdn:22222 for the second cam and so on…
http://docs.nethserver.org/en/v7/firewall.html#port-forward
Another way is reverse proxy, so you can reach it like https://public-ip-or-fqdn/cam1…
docs.nethserver.org/en/v7/proxy_pass.html
I’d put it in the green zone so it’s under control of Nethserver, you have to do it if you want reverse proxy.
Do you have WLAN on your router?