Enabling vs not enabling NAT under AEBS settings

I started noticing lately I haven't been able to connect to my network anytime I am outside of it (starbucks, office, etc) and was wondering if my port forwarding settings could have been changed.
I noticed that there is a box checked for NAT under my airport extreme settings which I never had checked before and wanted to know what this is doing and if it could possibly be interfering with my ability to connect to my network.
I believe I have all the correct ports configured but wanted to hear what you guys thought.
Thanks

I noticed that there is a box checked for NAT under my airport extreme settings which I never had checked before and wanted to know what this is doing and if it could possibly be interfering with my ability to connect to my network.
Are you referring to the "Enable NAT Port Mapping Protocol" option on the NAT tab within the AirPort Utility? If so, this would be Apple's equivalent to UPnP on non-AirPort routers. UPnP (& NAT Port Mapping Protocol) allows a UPnP-"sensing" program to automatically open/close ports on the router in order to access services on the Internet ... and allow those services to access your computer.

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