Whatever you do, resist the temptation to upgrade your Airport Extreme Base Station to firmware 5.6. Man, it was nothing but trouble for me. The AEBS would work for a day or so, then it would refuse to let any wireless clients on. This happened for a week before I figured out what was wrong. At first, I thought it was the external 5dbi antenna that I added. But, after removing that, the freeze ups continued. I finally found postings about the firmware and the problems others have experienced. The 5.6 firmware will experience the lockouts that I experienced, plus on some DSL setups, PPPoE will refuse to connect. Here is the good news though: You can downgrade AEBS firmware. Get the much more stable AEBS 5.5.1 firmware from Apple HERE. Looks like 5.6 slipped passed Apple QA and got into the wild too quickly!