Hello, I have been trying to get an answer for this for months, with no success whatsoever! I purchased an Airport Extreme to replace the router I had, D-LINK DIR-827. However, when I connected it, I was surprised that it had the IP address from the ISP modem (Zhone). I noticed that the Airport Extreme was in Bridge mode, and when I changed it to 'DHCP and NAT' i got double NAT. When changed to 'DHCP Only' I didn't get a connection at all. So, what I am dying to know, is why does the D-LINK DIR-827 can provide DHCP, but not the Airport Extreme? The only thing I do with the D-LINK is connect it from the ISP Box (Zhone) to the WAN slot, and it just works. The D-Link gives me a DHCP from 192.168.0.100 to 192.168.0.200 (And I can change it to any value I want.. it's not a static IP, I can just change the range of the DHCP). When I try to do the same in the airport either I can't get online, or I get double NAT! Why is it that the D-Link can do that by itself with no configuration? I want the Airport Extreme to do the same! The reason for that, is that I connect via ethernet to the ISP box so I get that IP address (the one assigned from the ISP box) for whatever I am connecting, but I can also connect via ethernet to the DLINK and I get another IP address (192.168.0.101, for example). If I have the Airport in bridge mode, I can't do that, and it would only serve as an "extension". I don't want that. I want the Airport to give me a different address just like the D-Link does, but not the one from my ISP. For example: I connect Computer A via ethernet to ISP box (Zhone).. I get IP address 184.108.40.206 I connect Computer B to D-Link via ethernet and I get IP address 192.168.0.104 I connect iPhone A via WiFi to D-Link I get IP address 192.168.0.102 As you can see, both the ISP box (Zhone) and D-Link have different IP addresses assigned. When I connect the Airport, I can only get the IP addresses from the ISP box (Zhone) (because it is in bridge mode) but I want the Airport to also have its own IP Address: I connect Computer B to Airport Extreme via ethernet I get IP address 10.1.15.1 (for example).. When I select 'DHCP and NAT" option in Airport settings, I can select the range (the same way I can do it on D-LINK), and I do get the behavior I want, but then I get the "Double NAT" WARNING! Why?? Why does the D-Link can do it without "Double NAT"? I have read on the internet, that I need to request my ISP to put their modem (Zhone) on bridge mode, but why does the Dlink work without doing any of that? Is there anyone here that could explain to me that? What should I do so that I get the same behavior of the D-Link 827 on the Airport Extreme, without any errors or warnings? Please help me! I have been trying to solve this for more than 6 months!