Answer for:

get server to work through cable modem?

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if you forward port 80 to the server then all "inbound" requests on port 80 go to the server.

here's how typical default configuration of consumer level firewalls work. requests from computers [hosts] on the lan are always allowed. That means that if a computer on a lan requests a web page, the firewall will allow the return traffic to that computer.

Inbound requests are always blocked unless specifically allowed.

If you wish to host a web server, the router needs to forward all inbound requests [http or port 80] to the web server. This does not interfere with other computers outbound requests as noted previously the router will allow outbound requests and will return that traffic to the originating computer.

In IIS [Internet Information Services], you can host multiple web sites with only 1 IP by using host headers.

so you create a web site which will host your test site under the default web site and use host headers [] the configuration in your web site properties page is all unassigned IP addresses and under advanced settings you put in your host header [www.<your domain>.com

now as others have said, you need a DNS service which will point your domain name to your ISP assigned address.

that's how you do it.

you can use an old computer to host your web server [those old Socket A AMD Athlon 2200s will work]hook it up to your router and forward inbound port 80 traffic to it.

when you put your url in your web browser [http://www.<yourdomain>.com the web server will send you your web page.