• Windows IP Routing is turned on so that traffic to the IP address of the Sharing Interface (192.168.0.1) is routed to the Shared Interface (typically a DUN connection or a Cable Modem Adapter), which automatically becomes the default route.
• A device driver intercepts all traffic routed to the Shared Interface.
• The Address Translation and Port Mappings are applied (or undone) by that device driver.

Note that if you don't have ICS installed on your Windows 98SE machine, none of the following instructions apply. Instead, you simply configure NAT32 as outlined in the Reference Manual.

To share a PPP connection

• Create a file called: exclude in your NAT32 directory.
• That file must contain the single line: Internet Connection Sharing
• That Adapter will then be excluded when you run NAT32.
• Start NAT32 as: nat32.exe 1
• Do not start it as you normally would: nat32.exe ppp 1
• The NAT32 Interface Configuration Dialog Box will appear. The following settings are required:

• Note that the Gateway must be specified as 192.168.0.1 and that the Primary Interface checkbox must be checked.
• Click OK.
• NAT32 will now use the Address 192.168.0.100 as its IP address on that Adapter, and your other machines must then use that address as their Gateway and DNS addresses.
• The NAT32 Console will print the warning that IP Routing is enabled. You can safely ignore this warning.
• Note that NAT32 knows nothing about the PPP Connection in this configuration. None of the DUN Menu Items will be enabled. To start or stop a PPP Connection, you must use Dial-Up Networking from within Windows.

• Follow the same procedure as above, making sure you exclude the ICS Adapter.
• Start NAT32 as: nat32.exe 2
• Be sure to specify the 192.168.0.1 address as the Gateway, and be sure to check the Primary Interface checkbox on the NAT32 Interface connected to the Windows 192.168.0.1 Adapter.