These instructions assume you use a router to firewall your home network. In order for you to be able to access a machine on your home network from the outside world you will need to open the relevant port (e.g. 22 for ssh, 80 for http). To do this with the Linksys Wireless G Router follow these instructions:
To test that this worked, you will need to find the IP address that was allocated to you by your broadband provider. To find this, follow these instructions:
Now open your web browser and enter that IP address. The front page of your website should now be available. If this happens port forwarding is working correctly. If your broadband provider does use DHCP you will have to get a URL and set up and use Dynamic DNS for you to continue accessing your computer in this way.