don't I need a static ip too fort forward also.
your suppose to put in your LAN ip (modem ip) which every deivce gets once connected to that modem, that LAN ip doesn't change even if you don't have static ip, in a dynamic ip your external ip is the one that changes, so in other words your LAN ip should not be change what so ever, unless you change it, and you are suppose to be using your LAN ip on the port fowarding