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Why can I not get Internet connection sharing to work with Windows Server 2012 R2?

Posted on 2015-01-04
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Last Modified: 2016-09-22
I have a server on which I have installed Windows Server 2012 R2.

Two NICs. One connected to Internet and one connected to a switch with all my workstations.

Having had my old Small Business Server 2003 to go by, I set up my AD, DC, adapters, DNS, DHCP to match.

I successfully joined all workstations to the new domain and all can log on to server and access files, but no workstation has Internet connection.

I've tried everything I can think of to no avail.

Any suggestions appreciated.
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Question by:Keith Pyle
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Expert Comment

by:VB ITS
ID: 40530712
Two NICs. One connected to Internet and one connected to a switch with all my workstations.
Is there a particular reason you set up your network this way? Do you intend to install some sort of proxy software on your server?

If not, just plug both server NICs to your switch along with your router.

You'll also need to configure DHCP to hand out the router's IP address as the default gateway if you haven't already done so.
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Author Comment

by:Keith Pyle
ID: 40530767
The DNS server has both the server DNS ip and the router DNS ip address.

I used the two NICs because that was the way it was on the old server.

I tried your suggestion; however, I lost Internet connection on the server until I put the old local line from the switch out of the "local" NIC and into the "Internet" NIC.  Still no access on workstations and the workstations no longer could see the Server 2012.
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LVL 24

Expert Comment

by:VB ITS
ID: 40531093
Can you please post the IP address settings of the following:

Your router
The "local" NIC
The "Internet" NIC
The workstations

Mainly after IP address, default gateway, DNS server settings.
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Accepted Solution

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Keith Pyle earned 0 total points
ID: 40532221
It turns out Windows Server 2012 is not designed to do what I wanted it to do.

I had to set up another router to handle the Internet network traffic and let the server handle just the local network traffic.

I am told the modern server software from Microsoft expects there to be an external router in the configuration.

So you were right. I did need to connect the Internet directly to the switch, but on the other side of a router.

Thanks for trying to help.
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