I want to use camera port forwarding to a system that can't use VPN. It appears that a Asus router allows a Source Target(whitelist) for an external port. Does this sound reasonable?
[Wireless][WAN] How to set up Virtual Server/ Port Forwarding on ASUS Router? | Official Support | ASUS Global
[Wireless][WAN] How to set up Virtual Server/ Port Forwarding on ASUS Router? | Official Support | ASUS Global