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ICS is much easier to set up in Win2000 than in Win98SE
and WinMe. There's no software to install,
and it doesn't add any network components or protocols. But Win2000
gives you less control over how ICS works. You
can't:
disable the DHCP server.
change the server's IP address or the range of addresses allocated by
the DHCP server.
share the connection over two different networks.
WARNING #1!
These instructions are for Windows 2000 Professional. They
don't apply to Windows 2000 Server.
WARNING #2 Don't
enable ICS if any
computer in your network is configured as a domain controller, DHCP server, or
DNS server. Don't enable it if another computer is running ICS or
Network Address Translation (NAT).
WARNING #3 To
enable ICS, you must be logged on as a user which is a member of the
Administrators group.
WARNING #4!
If you establish a Virtual Private Networking (VPN) connection while sharing a
different connection, the client computers won't be able to access the Internet
until the VPN connection is ended.
Continue below for Dialup setup. Go here for Cable Modem or 'DSL setup.
Setup
for Dialup Connection
If you are using a dial-up connection to connect to the
Internet in Win2000,
you'll need to do the following to use ICS:
NOTE:
It's important that you have a network card, modem, and dial-up
connection installed before you try to set up ICS.
ICS requires two network connections to work its magic. If it
doesn't see two (i.e. dial-up and the network card), it won't show you the "Shared Access" tab
in the dial-up connection's properties.
To prepare for ICS installation:
Set up your dial-up connection and test it so that you know
you can connect to the Internet.
Set up your LAN with TCP/IP so that you know your computers can
communicate with each other. If you don't know how to do this, go here.
With those steps completed, the rest is easy! Here's how I set up
Win2000 ICS to share a dial-up connection.
Open the Network and Dial-up
Connections folder by right clicking My Network Places on your
Desktop and selecting Properties. Then right click the
dial-up connection and select Properties.
The
Properties sheet shows the settings associated with the
connection.
Click
the Sharing tab, then check the Enable Internet Connection Sharing
box and the Enable on-demand dialing box.
If you have
more than one network adapter connected to local area networks, you'll see
this screen instead. Click the down arrow and select the one to use
for sharing the dial-up connection.
After
enabling ICS, click OK.
Win2000 warns you that it will change the IP address of the LAN
adapter. Click
Yes to continue.
Now open the dial-up connection's Properties again and go to the
Options tab to configure it. The connection will dial
automatically when a client computer requests Internet access. If
you don't want to have a window pop up on your screen showing that dialing
is in progress, un-check the first box. You can also configure the
connection to hang up automatically when it has been idle for a certain
length of time. Click OK after making the settings.
NOTE:
It's important that you have a network card, modem, and dial-up
connection installed before you try to set up ICS. 
