Mate
First of all which modem are you using if you have the standard optus one then follow the instructions below
go to this website and select your modem the dsl 302g i think it is for the standard modem
http://www.portforward.com/english/r...-302Gindex.htm
or this one to select your router model
http://www.portforward.com/routers.htm
Then follow this instruction
How do I Port Forward?
The process is fairly straightforward.
If your modem is directly connected to your computer, and you have the OS X firewall running (which is highly recommended in this case), you'll need to open a port in the firewall.
1. Open Transmission. go to preferences and enter a number for the port. This should be any number above 45000. Lets use 50001 for now. Then quit Transmission.
2. Open System Prefs >> Sharing >> Firewall. Click "New." In the "Port Name" pop-up menu, select Other, and fill in the settings as follows:
TCP Port Number(s): the port you chose in step 1 - eg 50001.
UDP Port Number(s): the port you chose in step 1 - eg 50001.
Description: Transmission
3. Click OK.
you can skip this step if you want (below)
If your modem is connected to your computer via a router (wired/wireless) you'll need to open a port in the router. In this case, it is probably OK to disable the OS X firewall, as you are already being protected by the router. To disable the firewall, open System Prefs >> Sharing >> Firewall. Click Stop.
1. Find out what your IP address is. You can find your computer's IP address (on Mac OS X) by going to System Prefs >> Network, double-clicking on your connection (for instance, Built-in Ethernet), and clicking the TCP/IP tab. It's probably something like 192.168.1.100, or 10.0.1.2.
You can skip this if you want (below)
2. Open Transmission. go to preferences and enter a number for the port. This should be any number above 45000. Lets use 50001 for now. Then quit Transmission.
3. Go into your router configuration screen. Normally this is done via your web browser using the address 192.168.0.1 etc. Apple's Airport uses an application called 'Airport Admin Utility' to configure it.
4. Find the port forwarding (sometimes called port mapping) screen. While the page will be different for each router generally you will enter something similar to the following:
For 'Application' type Trans
For 'Start Port' and 'End port' type 50001
For Protocol, choose Both
For IP address, type in your IP address you found in Step 1.
Tick Enable.
Click save settings.
For more comprehensive instructions specific to your router, go to
http://www.portforward.com/english/r...outerindex.htm and choose your router from the list.
How do I know if I've done it right?
1. Open Transmission.
2. Then go to this website,
https://www.grc.com/x/portprobe=50001
Replace the '50001' part of the URL with what ever port you have forwarded.
If you get 'Stealth', or 'Closed', the you haven't forwarded correctly.
If you get 'Open', then you have successfully port forwarded!
cheers
jeremy