Working with firewalls and routers that have network address translation (NAT) can often be confusing when troubleshooting or configuring unless one knows what the address is as it is seen by the Internet.  There are many sites that will show your public Internet address, but whatismyipaddress.com is straightforward with a Google Map mashup to show your location.

http://www.whatismyipaddress.com

Here's what to do If your private internal network address is needed and you are a Windows user:

*  From your taskbar click Start.
*  From Start's menu select Run.
*  Type cmd into Run's text box and click OK.
*  After the command-line box appears type ipconfig/all and press your Enter key.

Your internal ip address will now be displayed within the command-line box alongside the computer's hostname, subnet mask, default gateway, and more.