Testing Port Forwarding
Posted on 2005-04-11
I have been struggling with this for a very long time. I have an ADSL connection at home, I also have a small (3 computer) windows network setup. I use an ADSL Gateway (Linksys - BEFDSR41W), it is also a modem/router and 4 port switch. What I am trying to accomplish is to be able to host a website on one of my servers.
I have setup a webserver on my computer (IIS) and tested it using local IP address/localhost etc in the browser this all works fine.
I have setup port forwarding on my the linksys gateway (Ext.Port 80 TCP to forward to local IP address of my webserver).
My web server has a software firewall installed on it so I have setup a rule to allow all traffic on port 80 to/from the computer. I have Sygate Personal Firewall installed and the rule description reads as follows:
"This rule will allow both incoming and outgoing traffic to/from all hosts on TCP remote port(s) 80 to/from TCP local port(s) 80. This rule will be applied to all network interface cards. The following applications will be affected in this rule: Internet Information Services."
I dont have a static IP address but my IP address stays the same for quite a while (changes whenever I reset the gateway). When I type the IP address of the gateway in a web browser on a external computer I would expect it to forward my request to the webserver which should server the web pages, but unfortunately this doesn't happen. If I use a local computer I am presented with the admin pages for the ADSL gateway.
Does anyone have any suggestions or possible techniques/tools which will help me narrow in on the point of failure.