setting up router to allow incoming PayPal IPN notifications

[#1]

Hi
I'm working on some code for PayPal transactions. However in order to test it I need to allow PayPal to send IPN
messages to my local machine.
I have a Thompson router:

Product Name: TG585 v7
Serial Number: CP0915SF8W3
Software Release: 7.4.4.7
I have been playing with the setup but I am confused. I see there is a game/entry for PayPal IPN.
Does anyone out there have experience with this and can point me along in the right direction?
cheers
Gus

[#2]

I've only dealt with it at an enterprise level, but assuming you've written a listener you'll need to forward the ports to the server your listener is on.

[#3]

The game/application rules available on the router should help but you might need some info from Paypal as to which ports need to be specified for your IPN listener to receive messages and deal with them in which ever way you're systems are set up to do.

[#4]

I found this:
http://demos.ipn-easy.com/Howto/TestEnvironment.aspx
and the section on router setup gives an idea but I am baffled as to how to configure it properly in the router setup.
Ideally I want to be able to load a test page or local web site remotely. Something like:
http://myIPaddress/testpage.aspx
Gus

[#5]

I have some sample .net code in c# from PP that I will use for the listener but I want to get the router set up first and make sure I can load the test page externally before I
get to that part.
The PP sandbox will be calling an url I specify in the notify_url parameter or setting.

the url will look something like this:
http://81.45.12.128/PP_Listener.aspx.
Gus