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Advanced Windows Networking Question

By thedrummer2006 ·
I have a Trend Micro Internet web security server(windows server 2003) which is protecting two networks. I am using a Mikrotik software router to control all of the traffic between the two networks and the IWSS server as well as traffic between the IWSS server and the internet. In case you are not familiar with the IWSS server, I pass all traffic to and from the internet through this server using two NIC's and a couple NAT rules in the server. The server scans all traffic as it goes through and blocks certain things as well as logs everything that goes through. The mikrotik router is handling NATing between the two networks and the IWSS servers first nic at address 192.168.20.1/24. This is all working very nicely with only one problem and im sure there is a way to handle it im just not sure how.

As far as I know you can only have one gateway on a server which is setup on the second NIC to allow internet access. With this setup, the IWSS server cannot find my domain controller in the office network. I can ping the DC from the IWSS server and I can ping the IWSS server from the DC so I know I have my NAT rules setup right. I have also set the gateway to NIC one which will allow the IWSS server to see the Domain controller but I lose my internet connection.

How can I keep the internet connection as well as have a connection to my office network. Any help would be greatly appreciated.

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