I am posting this question here in the hopes I can get a quick answer. Just had Fios installed at my home today. I was a work but ran home to make sure all was going smoothly. When I got there he brings me into my office and shows me my old Vonage router & Comcast modem aned says here is all the stuff you no longer need. Then he points to my AirPort Extreme sitting on my desk and says "I didn't know what that was, so I just disconnected it and set up the Fios Router..And all is working fine." I looked at him and said, "Are you kidding me...What do you mean you just disconnected it and all is good?!?". He just looked at me and didn't have an answer. Anyway, I tied it all back in and it wasn't working. There was an error on Base Station so I went into the AP utility and it said "Double NAT..If you are trying to connect this to another Broadband unit, go into settings and disable NAT and use a Bridge conntection." So that's what I did and everything began working properly. I still have 2 separate wireless networks (AP & Fios) and everything seems normal. My question is..What exactly did I do by changing it to "Bridge". I am not network savy AT ALL, so if anyone has a simple explanation I would most appreciate it. And is there anything else I should do given the set-up. Thanks in advance! And my apologies for posting here.