Here is the scenario that I have. I have a computer connected to an ex15 on AT&T at a site and a computer connected to another ex15 on AT&T at another site. When I try to ping from one to the other they cannot ping each other. I am using there wan address to do this. Now I can ping both of them from a computer on a comcast network. They can ping the computer on the comcast network. Is there a setting that has to be enabled or added in order to get them to see each other?