How to create an outside port to test VPN connectivity?

I worked at a company once that had a port you could plug your computer into and it was like you were coming from the public IP (great for testing VPNs).

How could I set that up? I have a Netgear WNDR4500v2.

Best regards,
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How many public IP addresses are you getting from your ISP?  Assuming you get more than 1, you can connect your Internet to a switch, and then keep your router connected to that switch with the current config, and add a second router with another one of your public IP's configured and use that as an external point to your network.

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TheHappyTechAuthor Commented:
May I ask how to configure the second router (simple terms is fine) to have that as an external point?
it would have a similar configuration as your existing router, the only difference being the WAN IP would be different.  Also you should make the DHCP range not overlap with your current DHCP to avoid issues with troubleshooting VPN

if your ISP gives you the network then you have 6 public IP's you can use and let's say you're using

then on your second router you'd use
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