have you set the DMZ host? Put the IP of the computer you want your friend to connect to in the DMZ host, but give your friend the IP the cable modem/ router is assigned by your ISP, I use this router and I use this method to do ftp and host games I have never had any problem. If you use the DMZ settings then you will not have to assign IP to your computers or port forwarding let your router do the work
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