get server to work through cable modem?

By mike.alberga ·
I used to have a t1 line with 4 ip addresses
Now I just have a cable modem with 1 ip.
Is there a way I can get to my sever from the internet using the cable modem?
I have a domain name that I want to point to the cable modem IP and have it go to the server
I am running windows 2k server and IIS 5
any ideas?

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clarification please...

by Triathlete1981 In reply to get server to work throug ...

where is the server, inside the modem in your house/office? or you are inside the modem (relatively speaking of course) and the server is out on the internet?

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by mike.alberga In reply to clarification please...

The server is in the home behind the modem.

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remote in

by Triathlete1981 In reply to get server to work throug ...

if what you're trying to do is simply access the server, go to and sign up for their free remote software. you'll have to download the client on the server. from that point, you can go to any web browser anywhere in the world and go to and use the sign-on credentials you first entered when downloading the client to access the server.

i think that's the easiest way. when you sign up, you'll actually be starting a 30-day trial of logmein pro, which you'll have to pay for after 30 days. but after the 30 days, you can still use logmein free. for all intents and purposes, it's probably good enough for what you need.

we have 100 users on my network. i set each one of their computers up with logmein free, signing up a different uesr for separate computers (one pc per logmein free account)and saved tens of thousands on remote software like gotoassist.

otherwise, you can use vpning, but the logmein's easier to use if you're a novice.

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open server to the world

by mike.alberga In reply to remote in

Thanks Ramirez, but I want to make the server public open to anyone.

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You also might want to look at DNS2GO

by rkorb In reply to get server to work throug ...

The public IP address assigned by your cable modem ISP is dynamic and may change as your ISP sees fit - (unless you requested a static IP which is more expensive - I'm assuming you didn't do that). So the problem from a DNS point of view is that there's no stable IP address to assiciate with your domain name/server. DNS2GO solves that by providing a hosting your domain name and pointing the DNS record to the latest IP address your ISP may have assigned. That way one someone goes to "" it always points to your server. A couple pitfalls: - If you are using it for email be aware that in this age of spam the dynamic IP might cause email sent from your own server to be rejected by some spam filtering systems. Also - Don't know about your cable modem service, but my outgoing speed is about 1/10 that of my incoming. So for serving web pages you'd be better off on a low-cost hosting service. But I agree with the other poster about it's a good service that runs like Windows Terminal Services. Best of Luck..

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Here's a good article for you

by georgeou In reply to get server to work throug ...

Shows you how to set up a Dynamic DNS account with a non-static IP address. Also shows you how to NAT devices with a cheap router.

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DDNS is the way to go!

by amsprich In reply to Here's a good article for ...

I agree with the previous 2 posts DDNS (Dynamic DNS) is great. Any current router should be able to sync with ddns. I use, they also have a program you can run that will auto update your ip for you. For remoting us logmein it's better than remote desktop since it runs in a browser and needs no extra ports open. Also if you do register a domain name, check out google apps for my domain. They will host up to 25 different email @yourdomain. Which gives you all the benefits of gmail but using you own name for free. (includes pop3 also).

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keep in mind

by ddehaan2 In reply to get server to work throug ...

Besides needing to watch out for the IP address changes that will inevitably take place - you may want to consult your ISP's terms of service page to make sure that you CAN place a server behind the cable modem. There are several cable providers that DO NOT allow you to have a server on their network. Almost all cable providers have an area that they refer to as "acceptable bandwidth usage" if you exceed this usage your service will be completely suspended and it may take an act of God to have things reactivated - so be careful with what you serve.

Any of the services out there that offer dynamic DNS services (you will still have to decide which to use) will be essential in your serving - but make sure that you watch what you are getting in to and Good Luck!

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Route to server

by mike.alberga In reply to get server to work throug ...

Thanks for all you help!
After reading the artical
if I route all port 80 calls to the server, will the other computers on the LAN be able to surf the Internet?
my thought was putting another nic card in the server and attaching the cable modem to one nic and the router to the second nic. Then all calls to my IP would pass through the server. I don't expect much traffic. I only want to be able to test my site. The main problem is I wrote in VB.Net and have a second server that is only running MS SQL 2000. My big mistake was writing the application in web based mode to my server when I had 4 IP's. Now I can't even open my application in Visual Studios because it is pointed to which I can not reach. Any ideas or help would be great!

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port forwarding

by CG IT In reply to Route to server

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.

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