MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

15-42 Chapter 15 Configuring Network and Internet Connections
Lesson 4: Configuring Internet Connection Sharing (ICS)
ICS offers a simple way to configure computers in a small home office network to
share a single Internet connection. For small networks, ICS offers a cost-effective way
to provide Internet access to multiple computers.
After this lesson, you will be able to
■ Configure ICS.
■ Identify the limitations of ICS.
■ Troubleshoot ICS on a computer running Windows XP Professional.
Estimated lesson time: 10 minutes
Introducing Internet Connection Sharing (ICS)
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When you set up ICS on a network, the computer with the physical connection to the
Internet (whether that is a modem, cable, or other type of connection) is designated as
the ICS host. Other computers on the network connect to the Internet through the ICS
host, as shown in Figure 15-23. In addition to providing Internet access, the ICS host
computer also dynamically allocates IP addresses to the clients on the network, provides
name resolution, and serves as the gateway for the other computers.
Internet
Modem
ICS Host
ICS Clients
Figure 15-23 The ICS host has a shared Internet connection and acts as a DHCP server for
network clients that obtain their IP addresses automatically.