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No, that type of thing isn't in the port forwarding config.

This feature is something I've only ever seen in the higher end firewall/routers and that's a pity. I could be way off the mark here but I'm sure it's fairly trivial to expose this in the GUI (if you know what you're doing, of course!

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It's also a bad idea for the purpose you're using it for, because anyone can spoof the employer IP address and get to your VNC port.

The chances of someone knowing my work IP and spoofing it while attacking the VNC port on my dynamic home IP is a risk I'll live with!