Configuring Port Forwarding
In Windows world its easy to forward your ports but in MAC it’s a little tricky. Here is how to do it.
Please follow all the steps provided by LAB Computer.
Feel free to let a MAC pro handle this for you if you are not comfortable, LAB MAC Repair service is the best in Long Island
You can direct traffic coming in to your NAT network to a specific IP address behind
the NAT gateway. This is called port forwarding.
Port forwarding lets you set up computers on the internal network that handle
incoming connections without exposing other computers to outside connections.
For example, you could set up a web server behind NAT service and forward incoming
TCP connection requests on port 80 to the designated web server.
You can’t forward the same port to multiple computers, but you can forward many
ports to one computer.
Enabling port forwarding requires the use of the Terminal application and
administrator access to root privileges through sudo.
You must also create a plist file. The contents of the plist file are used to generate
/etc/nat/natd.conf.apple, which is passed to the NAT daemon when it is started.
Do not try to edit /etc/nat/natd.conf.apple directly. If you use a plist editor instead of
a command-line text editor, alter the following procedure to suit.
To forward port traffic:
1 If the file /etc/nat/natd.plist doesn’t exist, make a copy of the default NAT daemon plist.
$ sudo cp /etc/nat/natd.plist.default /etc/nat/natd.plist
2 Using a Terminal editor, add the following block of XML text to /etc/nat/natd.plist
before the two lines at the end the file ( and ), substituting your
settings where indicated by italics:
<key>redirect_port</key>
<array>
<dict>
<key>proto</key>
<string>+tcp or udp+</string>
<key>targetIP</key>
<string>+LAN_ip+</string>
<key>targetPortRange</key>
<string>+LAN_ip_range+</string>
<key>aliasIP</key>
<string>+WAN_ip+</string>
<key>aliasPortRange</key>
<string>+WAN_port_range+</string>
</dict>
</array>
3 Save your file changes.
4 Enter the following commands in Terminal:
$ sudo systemstarter stop nat
$ sudo systemstarter start nat
5 Verify that your changes remain by inspecting the /etc/nat/natd.conf.apple file.
The changes made, except for comments and those settings that Server Admin can
change, are used by server configuration tools (Server Admin, Gateway Setup Assistant,
and serveradmin).
6 Configure NAT service in Server Admin as needed.
For more information, see “Configuring NAT Service” on page 126.
7 Click Save.
8 Start NAT service.
If you need assistance or someone to help you, please contact LAB by clicking the link.

