In case you don’t know we are going to make a little excursion to the ipconfig command. In Windows go to Start → Run → type cmd in the run field → enter → a black command line, “DOS box”, opens → type in the following: ipconfig /all (notice the space before /all) → now copy/paste the data for your second NIC in your reply.
We are first going to define your local network. Go to Firewall → Common Tasks → My Network zones → Add → A new network zone → fill in a name like My Home Network → Apply.
Now select My Home Network in the list → add → A new address → choose and IP address mask → fill in 192.168.0.1/255.255.255.0 → Apply → Apply.
Next step is to use the Stealth Ports Wizard to make your home network trusted. Go to Stealth Ports Wizard under Firewall → Common Tasks. Choose “Define a trusted network stealth my ports to EVERYONE else” → Next → select “I would like to trust an existing My Network Zone” → in the drop down box below choose “My Home Network” → Finish. Now we are done here.
By default CIS is set to be a Internet Connection Gateway (ICS server). Make sure it is still set. Go to Firewall → Advanced → Firewall Behaviour Settings → Alert Settings → make sure “This computer is an internet connectiion gateway (i.e. an ICS server)” is ticked. Apply and Ok your way back to the main interface.