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Windows XP: Internet Connection Sharing

On some countries, more and more families have 2 (or even 3) PC's:
- one for the parents, used for business work
- one for the children, to play
(and to do some school-work......)
Also in small office (without a big central fileserver acting as proxy-server), several people
need to connect to the Internet, but not everybody has a modem in this system or there
maybe are not sufficient phone-extensions available on the telephone-switchboard.

First introduced with
Windows98 SE and continued in Windows 2000, also Windows XP
Home and Professional include :
Internet Connection Sharing ( ICS )

Before you try to use the Windows XP Internet Connection Sharing on an office network,
be aware of the possible limits :
Windows 2000 allows up to 10 (= TEN ) computers to simultaneously share a single connection,
either dial-up or broadband , to the Internet, and all Knowledge base articles on ICS for
Windows XP state "home use and small office", so I assume the same limit as for
Windows 2000 may also apply to Windows XP.



The system with the modem or broadband-interface, establishing the connection to the Internet,
is called the "ICS Host", while the other systems, which connect now to the Internet via the
network and the ICS-Host, are called "ICS Clients".

The setup of ICS on Windows XP is very similar to ICS on
Windows 2000, which you can view
for full details and client connectivity ( like :
Windows 98/98 SE/ME as an ICS client ) :

In the properties of the
Network connections,
right-click on your
Internet connection and
select "Properties"
on the tab:
"Advanced", you can activate
"Internet Connection Sharing",
and select, whether the connection
would be established automatically
if one of the connected client
systems tries to connect to the
Internet.
Warning: when using the ICS,
Windows XP changes now the
IP-address of your network
card for the LAN to the default
IP-address for an ICS-host:
192.168.0.1
You will need to configure your other
computers to use the same subnet
(192.168.0.x ) or to "Obtain the
IP-address automatically", because
as ICS-host, Windows XP will
now act as DHCP-server.
You can check in the
Properties of your LAN
connection, tab : Status
that your IP-address has been
modified to 192.168.0.1.

I keep this documentation short, there is a very good and detailed setup description on the
Microsoft website in the
Knowledge Base article Q306126, which even includes a few movie-files
with sound showing it in detail ( just right-click on the movies and select "Play")

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