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czwgFlag for United Kingdom of Great Britain and Northern Ireland

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Using server as a router

I am a database developer with extensive LAN exerience. WAN Networking and routing is not a skill I claim.

One of my clients asked me at almost no notice to help him move offices and restore his IT system at the new premises. He had been using a hub provided by his ISP and a dedicated ADSL Line at the old office. I set this up.

The landlord offered connection to a switch shared with other tenants with fast Internet access.

The server is running Server 2003 and is set up as a DHCP server and domain controller.
Since it had dual NICs I decided to use the Routing and Remote Access service to set it up as a router from workstations on the  LAN to the landlord's provided Internet
One NIC
•      (Renamed WAN Connection)
•      Connected to Landlord's WAN switch
•      Uses DHCP to acquire an IP of eg 192.168.241.49
•      Has a default gateway of 192.168.241.1
The other NIC
•      (Renamed Local Area Connection)
•      Connected to client's LAN switch
•      Has a fixed IP 172.51.0.10
•      No default gateway specified

Workstations
•      Get IP from Server
•      Default Gateway 172.51.0.10

This all works.

Workstations can see the Internet and the server. AFAIK other tenants can't see my client's network But I'm not confident the system is (moderately) secure.

How should the servers' Windows Firewall be set up?

Are there any other network settings/precautions I could undertake?

Recommendations to call in a network expert or supply and set up a hardware firewall wouldn't be well received!

Thanks

Steve
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Bill Bach
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