Yes, I looked at that one, he is using a FIOS router, I don't have those capabilities on the GT784WNV, thanks anyway. I'm going to try Actiontec support and try to get a solution from them. I really don't want to change my router.
I contacted Actiontec support and got this reply:-
Actiontec Support Team’s response is: ========================= The GT784WNV/GT784WN does not support the loop back functionality. There are no settings within the modem that can be altered to change this.