I am currently using an Airport Extreme N Base Station (firmware version 7.6) connected to a cable modem to connect around 7 wireless clients and two wired clients to the internet. Prior to this I was using the same Airport Extreme with a DSL modem.
I don't know if my current situation arose when I switched to cable or if it started after a firmware update to version 7.4. My base station will lose access to the internet multiple times per day at random intervals. Attached is a screenshot of an airport status message that describes the Double Nat issue that seems to be causing my internet outages but I cannot understand why this is a sporadic problem rather than a persistent one.
I have googled for a solution and am not seeing any for my exact situation. I have read that this type of problem occurs when there is one router attached to a second and both are using NAT and DHCP. I understand that the way to fix this problem is to put either the modem or the Airport Base Station into bridge mode.
I would prefer to put the modem into bridge mode but it does not appear that my ISP, Cablevision, allows me to make configuration changes to my modem. I have tried putting my Base Station in Bridge Mode and have turned off DHCP and NAT but this results in a green status light on my Base Station with no access to the internet.
Is anyone familiar with my problem and what I need to do to correct it?