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To better understand how networking works, all Internet network based on IPv4 which is a protocol used in Internet system, that version has set of rules and how they were set up. There is no way to work around the rules that has been set years ago, and will always continue no matter what.
The simple rule is that each machines connects to Internet must have its own unique IP address, that way packets can be sent and recieve without going into other machines.
Of course router's job is to share one public IP address into inside networking system. That router assigns private IP address within inside the network, they have to follow the NAT rules, and it applies same thing, each machine must have its own unique IP address.
But that is not the problem causing anyone not able to have more than 1 VP at same time. The real problem is that with any routers, it can assign a port forward to ONLY one private IP address at a time, and they are not shareable. We have 65535 ports in our Internet system, and VP uses about 21 ports that needed to be used on. So, once these 21 port is assigned to VP A then the VP B will not be able to be assigned the same port. That is real problem. Its all about rules and technical limits set by Internet system.
I do not know about the effect on new Internet version IPv6 which should be release in future, don't ask me when. They may or may not solve the problem with multiple VP in same networking. BTW, the real number may solve the problem with IPv6 because their ip address format looks much like MAC ID and can be confused to general people. IPv4 has easier IP address than IPv6, FYI
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