I have an Ethernet cable without any routers from my ISP going straight to Airport Extreme. I have fixed IPv4 provided by ISP. I have 60 mB/s plan, which I always get if I connect any laptop straight to the Ethernet cable without any routers. When I bought and set up my Airport about a year ago, I was getting 60mB/s, i.e. Airport wasn't slowing down my internet speed. I've set it up as DHCP and NAT, input all the parameters for static IPv4, and it worked fine until recently... Last couple months i've been getting 20 mB/s at best (while still 60 mb/s without the router) I tried resetting to factory conditions, and setting up again. It did help for several hours. Then the speed droppd to 20 mb/s again... Does anybody have the same problem with this particular model of AirPort? Will be grateful for any troubleshooting tips!