I'm having a ports-closed problem possibly due to double NAT: my RCN cable modem, then my Airport Extreme, then my Mac (ethernet). I can't find instructions for setting the Airport Extreme in bridge mode. Please...?
iMac (27-inch, Late 2012), OS X Yosemite (10.10.5)
If you used Apple's setup "wizard", the utility should have picked up on the fact that you have another router "upstream" on the network and then should have applied the correct Bridge Mode setting, which Apple calls "Off (Bridge Mode)" to the AirPort Extreme.
To manually set up the AirPort Extreme in Bridge Mode.......
Open AirPort Utility on your Mac (Finder > Applications > Utilities > AirPort Utility)
Click on the picture of the AirPort Extreme
Click Edit in the smaller window that appears
Click the Network tab at the top of the screen
Change the setting for Router Mode to read "Off (Bridge Mode)"
Click Update at the lower right of the window and allow a minute for the AirPort Extreme to restart
Power off both the RCN cable modem and the AirPort Extreme
Wait a minute
Power up the modem and let lt run for 2-3 minutes by itself
Power up the AirPort Extreme and let it run for a full minute
You should be all set
how to set up airport extreme in bridge mode
