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NT Gateway Routing Problem

By fanchant ·
I am prepared an NT server to run Checkpoint's Firewall software. Prior to installing any of the Checkpoint software, Checkponit recommends you test the routing in general to make sure it's working. It's not.
The firewall has two NIC cards. The external NIC is 209.x.x.14/mask 255.255.255.240/gateway 209.x.x.1.
The internal NIC is 172.16.20.10, mask 255.255.255.0, no gateway.
I have the internal NIC attached to a hub. I have a PC attached to the hub. The NIC info on the PC is 172.16.20.123, gateway 255.255.255.0, gateway 172.16.20.10.
I can ping the internal and external cards on the gateway machine from the internal PC. I can connect to the internet from the gateway. I CANNOT connect to the internet from the PC. Trying to Ping anythingpast 209.x.x.14 gets 'request timed out' error. A tracert from the PC to an internet DNS server returns > 172.16.20.10, then times out.
I have added a route statement
172.16.20.0 255.255.255.0172.16.20.10 172.16.20.10.
IP Forwarding is enabled.
Any ideas? I presume it's something in my routing table but don't know what at this point.

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