I had to setup AT&T DSL last week. The modem itself didn't have a connection (blinking DSL LED, no Internet LED), and I made the mistake of mentioning to the tech that I was using an Apple router instead of the Cisco router they sent me. He stopped investigating the problem right there and the only thing he would do for me was transfer me to Cisco support for the router even though I expressly stated that there was no problem with the router.