I am running Win 7 on this computer, Win XP Pro on the other.
This one is connected to the internet by ethernet cable to a cable modem. For a short while (I believe) it was connected by ethernet cable to the DIR-615 and then to the internet through the cable modem.
When I got the DIR-615 configured (I had to do it manually, the wizard would not clone the mac address), I could connect to the local network (the one I set up on the router) with great signal strength. However, it showed no internet access. I tried a cable from the router to the computer and got the same result. When I ran the ethernet cable from the modem to the computer, I was back on line.
I assume that in configuring the modem manually I missed some important step, like "enable internet access," but I don't have any idea what, if anything, it was. I do remember skipping the first page on the configuration menu because I did not understand anything on it and decided to leave everything as default. I did set a new admin password and passphrase, and I typed in the mac address, since that was the reason for configuring manually.
I have reset the modem to initial default settings while waiting to try again.