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MCSE : Security Specialist Client Connections When you have a scenario in which clients on the LAN connect directly to the Internet and not through a NAT device, the clients should connect to the Active Directory domain controller using an internal network on a second network adapter. This prevents any issues that may arise if clients obtain an IP address from your Internet service provider (ISP). You can achieve this configuration with a second network adapter on the server connected to a hub. You can use NAT or ICS to isolate the clients on the local network. The clients should point to the domain's DNS server to ensure proper DNS connectivity. The DNS server's forwarder will then allow the clients to access DNS addresses on the Internet. Do not use ICS (recommended) Use NAT instead. ICS (Internet Connection Sharing) will break down all the DHCP and DNS functionality on your LAN. Try to avoid ICS at all costs. If you must, make the Domain Controller itself the ICS server, and let all clients obtain their IP configuration automatically. This of course is not a good security decision, because you will expose your Domain Controller to potential Internet threats. Again, and I cannot stress this more, avoid ICS on your corporate LAN and use NAT instead.