I got it to work, thank you for your help.
However I do have some odd things, happening with the comcast modem.
As an example I plugged the DIR655 to port 1 on the comcast modem, and then plug my laptop to
port 2 on the Dir655. I performed a connectivity test etc.. Everything works.
I then plug my other pc straight into port #2 on the comcast modem, for 5 minutes lost internet, I did a ping test no response. About 5 minutes later I am getting constant ping results and have internet.
So I am wondering if during the 5 min, if the comcast modem is rebuilding an arp table?
Because other than that I cannot make sense of what is happening.