Our expanded network schematic will
look like Figure 7-12.
This ICS technique works equally well whether you are using your cell phone
and USB data cable to make the data connection or you are using a PC Card cellular
data modem plugged into a laptop.
PC Card adapters are not for laptops only. Though not a common item, you can find PC Card
adapters that fit into desktop PCs so that you can use your PC Card devices (Wi-Fi or cellular
adapters, for example) in a home or office computer.
Setting up ICS in Windows XP brings with it Windows Firewall, so if you use a
separate software firewall product (such as Norton Internet Security or ZoneLab??™s
ZoneAlarm), you must disable Windows Firewall and then likely do some special
Figure 7-12
Using Windows XP
Internet Connection
Sharing to extend your
cellular data connection
to other computers
through an Ethernet
switch Cell Tower
Cell Modem
Cellular data
connection to the
Internet
Laptop configured with
Internet Connection Sharing
Ethernet
Ethernet
Ethernet
note
Cellular Internet Connection to the Rescue 51
configuration of your firewall software, or disable your firewall software and use
Windows Firewall, which easily accommodates ICS. To set up ICS:
Right-click My Network Connection and choose Properties.
Locate and right-click the icon and label for your cell modem connection and
choose Properties to open the Properties dialog box, shown in Figure 7-13.
Click the Advanced tab, shown in Figure 7-14, and then check all three of the
check boxes under Internet Connection Sharing.
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