An Internet Router and DHCP on Win 2003

Hi,
I am running Windows 2003 Enterprise Server as my DHCP Server for my domain, and I have an ADSL router with a static IP address. However, I can not access the internet anywhere. I have done a lot of networking before, but I have never seen this before. Could someone please help!?

My DHCP scope is from 10.150.41.1 - 10.150.41.21, and the DHCP server has a static IP address of 10.150.41.1. The router has a static IP of 10.150.41.2. My DHCP server is also my Domain Controller.

Any help would be greatly appreciated!

 

Let's start from the basics. To access the internet via a router you need two things: a path to the router, and a working DNS server to resolve internet names to IP addresses.

To get a path to the router, on a basic single router network, all computers need to have the default gateway set to the internal address of the router (10.150.41.2). If you are using DHCP, that means setting up a scope option "003 Router" with the IP address of the router.

If the router is working correctly you should now be able to ping the router:

Code:

ping 10.150.41.2

And trace a route to an external IP address such as a www.google.com server.

Code:

tracert 64.233.183.99

Next step is to get DNS working. On a Windows 2003 network, all computer need to point their DNS lookups to the DNS on the AD server. So 10.150.41.1 in your case. As you are using DHCP, you need to add the scope option "006 DNS Servers" and enter the 10.150.41.1 address as the primary (upper most) DNS server IP address.

With DNS configured, you should be able to resolve and then access an internet resource by name. So the following should now work:

Code:

tracert www.google.com

If this fails check your DNS set up. The most common problem is a dot domain created by 2003 DNS server if it is installed whilst not connected to the internet. The server assumes no other DNS server exist and makes itself the root server. This is easy to fix:
http://support.microsoft.com/kb/229840

You may also find this useful:
http://support.microsoft.com/kb/323380