|If you remove the default gateway IP from the TCP/IP settings for this device, it will not be able to access the internet. That's the quick, simple way to prevent it from accessing the internet.|
I would recommend you use a static IP on this box as compared to DHCP. Especially if it's going to be acting as any kind of a server.
As to external traffic coming into your unit from the internet, it should be blocked by default by your firewall. If it's not, your whole LAN is wide open begging to be hacked. Most typical firewall's come setup to prevent any/all inbound traffic to LAN clients and you actually have to manually configure port forwards to access internal computers.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.
message edited by Curt R