Following the recent Greenlight Networks upgrade, your Apple
router may display a yellow light on your device or a notification in the
Apple Airport utility. The message will say there is a Double-Nat status.
Please select the option to ignore this message as your router will need to
remain in DHCP and NAT mode (Do not use BRIDGE mode). Once competed the yellow
light on your Apple router should turn green and the notification will be gone.
You can also see instructions from Apple here at <https://discussions.apple.com/thread/3886506?tstart=0>.