Apple AirPort Networks Troubleshooting Guide download pdf (Page 38)

with port mapping without requiring any special configuration

on a computer or a base station. This option works only when the

software you’re using is aware of NAT-PMP and can talk to the base

station using this protocol, and when you have a publicly reachable

IP address assigned to your base station. You can find out more in

Punch Through with NAT-PMP.

• Use one computer as your default host: There’s a coarser

way to make NAT work, too, allowing a single

computer behind

the NAT gateway to act as though it’s directly connected to the

Internet. This option is appropriate in limited cases where you

want a machine to be reachable from the Internet on any of its

ports without getting publicly reachable IP addresses from your

ISP for computers on your network. I describe this default host

option in

Set a Default Host for Full Access.

• Configure and monitor your base station and mount

attached disks vi

a Back to My Mac: If you have an iCloud

account, you can access your base station remotely via AirPort

Utility for Mac in 10.7 Lion or later. Once you’ve accessed it, you

can reconfigure it or mount any internal (Time Capsule) or USB-

attached disks. I provide directions in

Access a Base Station via

iCloud.

Map Ports for Remote Access

Port mapping relies on network address translation (NAT). NAT acts

as a gateway between a WAN IP address for a router reachable from

a larger LAN or the public Internet, and the private addresses hidden

behind NAT on the base station’s LAN.

NAT Maps Private to Public Connections

When a computer within the LAN wants to connect to the Internet,

the NAT software creates an association between that computer’s

outgoing connection and a public port on the WAN IP address of the

base station. (I talk more about

Ports in the sidebar slightly ahead.)

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Apple AirPort Networks Troubleshooting Guide Page 38