I am assuming you want to have a port that will link directly to your PC from the outside world - to host a server, but you want to open an incoming port.
Can you get into the web interface of your router?
(I have a good knowledge of Netgear products but I don't know yours exactly but they should be very similar)
Once in the web interface you first need to make your PC's IP address static. So you can manually do that on your PC or select it from the list within the router config.
In the router choose LAN IP setup and then a column at the bottom should say address reservation and you should have a button which says ADD, click the add button.and you can manually assign an IP to it and add the MAC address but it should already be there with your computer name and the IP it has been assigned - if you select that one and click add again it will add it to the router and always give that PC that IP address.
Next you need to add the port you want to use as a service. So click on Services then add custom service, give it a name and choose TCP/UDP and choose the start port and end port that you want top open for one port choose just the same for both and click Apply.
Next you need to forward the port to that IP address. So click on Firewall Rules. here you have inbound services and outbound services Click Add on the one you want (I assume it's inbound)
Then choose firstly the name of the service you created then Allow Always and in send to LAN server choose the IP address of your pc (which is why it needs to be static or it might go to the wrong PC) and then click apply.
The rule should now be active I don't think you need to restart the router but if it doesn't work you can do that.
Let me know how you get on and feel free to ask me questions.
Http://kb.netgear.com/app/products/model/a_id/12594
above is a link to our router if you ever have any other issues or questions
http://kb.netgear.com/app/answers/detail/a_id/63
above is a step by step guide on how to step up our ports
You need to setup port forwarding read below.
Once you open the set up interface of
the router, you will be able to find the settings on the router where
you can open the ports for the particular program.
If you
are opening the ports for a special device in your network, then you
must know the IP address of that device.
For
example, wireless camera, DVR, X-box, Play station ...
You
can choose the option PORT FORWARDING for a
special device application.
If you
just want to open the ports for all the network, then you can choose PORT
TRIGGERING
For Linksys Router.
You have opened the set up interface of
the router. You will see Application and Gaming TAB at the top.
If you
click on that tab you will find different Sub tabs.
Click on
Port Triggering => Here you can open the port numbers for the
network.
Click On Port forwarding if you want to
open the ports for a special device in the network.
Click
Save settings once you open the ports on the router.
For D-link router
You have opened the set up interface of
the router.
You will see Network settings in the
left hand side panel of the page.
Click on
Network settings and go to the Advanced TAB at the top.
Now you
will find the option. Pot Forwarding in the left hand panel.
Here you
can open the ports on the router.
BELKIN wireless router
You have opened the set up interface of
the router.
Click on Virtual Servers under Firewall
in the menu on the left
Click Enabled. Type a
general description of the application i.e.. Remote Desktop. Type the
port(s) specified by the program manufacture for both of the Inbound
port fields. Select TCP, UDP, or BOTH for the Type.Private IP address:
Enter the IP address of the computer you want grant access too. Type the
port(s) specified by the program manufacture for both of the Private
port fields.Click the Apply Changes button.
NETGEAR Router.
You have opened the set up interface of
the router.
Click on Port
Triggering under Advanced menu.
Change
the value of Port Triggering Timeout as 20 Click on
Add Service. Specify a
Unique/User Defined name under Service
Name. Ex: Mails, VPN. Specify the Service
User as Any (if all
the computers in the network are port triggered or if a single computer
on a network is port triggered specify the IP address of the computer).
Select the Service Type of the
port to be triggered
Ex: TCP . Specify the Trigger
Port (The
port to be triggered). Select the Connection
Type of Inbound Connection. Specify the
Starting and Ending Port for Inbound Connection. Click Apply to
accept changes. Your router is now set up for port triggering..
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