Hi I would like to know if the router opens the needed ports immediately when creating a VPN server on it. I created a l2tp vpn server on my router and I never opened the needed ports so that makes me think that the router forwards the ports to iteself on the server creation. Can someone verify that. is there a place I can see all the opened ports (vpn forwarded and service ports for the omada fleet etc). 

Thanks in advance.