Port Mapping and Port Forwarding are synonomous and have been used interchangeably.
In order to configure your 802.11n AirPort Extreme Base Station (AEBSn) for Port Mapping/Forwarding, you will need to know at least two things: 1) The MAC hardware address of the Security DVR, and 2) Which UDP & TCP ports need to be opened to allow access from the Internet to the DVR.
Once you know these, it's pretty much a simple matter of "plugging-in" these values into the AirPort Utility.
The following is the basic steps to do so:
To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the Security DVR.
Internet > DHCP tab
o On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
o Description: <enter the desired description of the host device>
o Reserve address by: MAC Address
o Click Continue.
o MAC Address: <enter the MAC hardware address of the Security DVR>
o IPv4 Address: <enter the desired Private IP address>
o Click Done.
2. Setup Port Mapping on the AEBSn.
Advanced > Port Mapping tab
o Click the "+" (Add) button
o Service: <choose the appropriate service from the Service pop-up menu>
o Public UDP Port(s): <enter the appropriate UDP port values>
o Public TCP Port(s): <enter the appropriate TCP port values>
o Private IP Address: <enter the IP address of the host server>
o Private UDP Port(s): <enter the same as Public UDP Ports or your choice>
o Private TCP Port(s): <enter the same as Public TCP Ports or your choice>
o Click "Continue"
(ref:
"Well Known" TCP and UDP ports used by Apple software products)
