I appreciate the breakdown, but I meant i was ignorant on why port forwarding was important for a VPN :) Was still a great write up that should be used as reference for others! :D
I didnt realize you still had to port forward to get around ISP traffick shaping/blockage with a VPN. Thought the encrypted tunnel between you and the VPN disguised that, and any port stuff was done at their end, after exiting the tunnel.