HELP needed: PPTP with client-to-client

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Hi there. I have sucsessfully set up a plain/normal PPTP-server from the GUI with ease, same goes for OPENVPN, and in OPENVPN theres the option for "client-to-client" communication, allowing two computers connected to the VPN server to communicate with eachother.

My scenario is basically something as simple as wanting to "OPEN LAN" on a computer in my LAN in Minecraft, and letting an external PC from the internet connected via the PPTP-server on the router to see that computer`s opened LAN game on Minecraft.

Basically doing the same as Hamachi does, a VPN with client-to-client communication allowed, not just client-to-router.

I reckon its not possible within the GUI for PPTP, but I really want to be free of having to ask someone to install either Hamachi or Openvrt client on their computer, so my questions are:

A: Can it be done dynamically with ip/itables / forwarding of some sort via script/ssh?

B: When issuing iptables and ip- commands, is this written into config-files / permanent, or will it all go back to default on reboot? My concern is ruining my N66U if I play around with iptables/ip, but it its non-stick (needed to reimplement each reboot), then I can experiment safely.

I know this is asking much, so I thank anyone for even just reading this post. Thanks in advance nonetheless.

 

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bumping this (sorry).

Basically short story (I wrote a bit much in first post):

A: Will messing with ip / iptables be permanent / write itself to config-files somewhere or nvram, or can I safely experiment with it? (meaning if i want it "permanent" ill have to put it in some start scripts e.g wan-start or services-start)

B: Possible to use iptables / ip command with a FORWARD to all clients when packet comes in from a VPN-client and vice versa, basically gaining a VPN client-to-client communication like the option in Openvrt?

Thanks in advance for any light on this matter.