Internet Connection Sharing Hugh Taylor Support Professional Platforms Support Microsoft Corporation

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Internet Connection SharingHugh TaylorSupport
ProfessionalPlatforms SupportMicrosoft
Corporation
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Overview

• Benefits of home networking
• Topology of Internet Connection Sharing (ICS)
• How ICS works
• How to set up and configure ICS in Microsoft
  Windows 98 Second Edition, Windows Millennium
  Edition, and Windows 2000
• Issues to be aware of
• Phone line networking caveats

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Benefits of Home Networking

• File sharing optimizes available hard disk free
  space
• Use of peripheral devices from any computer
  scanners, printers, tape drives
• Collaboration, cooperation
• Multiplayer games
• Wired household

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Anatomy of a Home LAN
Printer
Scanner
WebCam
Hub

• Internet
• Universal Plug and Play

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Benefits of ICS

• Multiple computers use a single Internet
  connection
• Private IP addressing masks IP addresses to
  prevent attacks
• ICS host forwards requests from ICS clients to
  Internet, and forwards replies from Internet to
  ICS clients, only computer visible
• Cost versus multiple connections

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General Topology

• Home network with all computers connected by
  Ethernet, phone line, or wireless
• One computer set up as the ICS host and which has
  the connection to the Internet
• ICS host shares its Internet connection, and
  assigns private IP addresses to clients
• Remaining computers set up as ICS clients
• ICS host routes traffic from clients to Internet

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General Topology
ICS Client 1
Modem
ICS Host
Hub
Internet
ICS Client 2
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How Network Address Translation Works

• ICS host assigns clients addresses from the
  Private IP class C address pool
• ICS host maps IP addresses of clients to dynamic
  port numbers
• ICS host forwards requests from clients to
  Internet
• ICS host forwards replies from Internet to client

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How Port Mapping Works
Port Map X 2958 Y 3256 Z 4223
ICS Host
192.168.0.X
Example 10.0.0.1
ICS Client 1
192.168.0.Y
Assigned by ISP
ICS Client 2
Internet
192.168.0.Z
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How Host Forwarding Works
Port Map X 2958 Y 3256 Z 4223
to Microsoft.com from port 3256
from Microsoft.com to port 3256
to Yahoo.com from port 4223
Internet
from Yahoo.com to port 4223
ICS Host

• Host forwards packets to port 3256 to 192.168.0.Y
  which is Client 1
• Host forwards packets to port 4223 to 192.168.0.Z
  which is Client 2

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Installing Windows 98 Second Edition
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Installing Windows 98 Second Edition (2)
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Installing Windows Millennium Edition
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Installing Windows Millennium Edition (2)
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Installing Windows 2000
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Installing Windows 2000 (2)
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Configuring Windows 98 Second Edition
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Configuring Windows 98 Second Edition (2)
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Configuring Windows 98 Second Edition (3)
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Configuring Windows 98 Second Edition (4)
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Configuring Windows Millennium Edition
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Configuring Windows Millennium Edition (2)
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Setup Caveats, Tips, and Issues

• Ensure that your ISP supports ICS
• Finish the Internet Connection Sharing Wizard, or
  uninstall ICS to prevent upgrade issues
• Only one ICS host needed
• Virtual LAN drivers common with Windows 2000 and
  PPP over Ethernet (PPPoE)
• Get the latest version of PPPoE software for your
  DSL or cable modem connection

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Networking Caveats, Tips, and Issues

• NetBIOS naming conventions for machine and
  workgroup names
• Browsing issues
• Protocol and binding issues
• Static IP addresses
• Did I mention, use the wizards when possible?

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Networking VPN and ICS
Internet
ICS Client
hub
Internet
ICS Host
ICS Client
If a client establishes the tunnel
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Networking VPN and ICS (2)
To VPN Server
ICS Client
hub
ICS Host
Internet
ICS Client
If the host establishes the tunnel
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Phone Line Networking

• Cabling
• Utilities using the phone line for meters
• Extensions versus separate lines for voice

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Other Caveats

• Multiplayer games
• Secure sites
• Customized sites

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Basic Troubleshooting

• Host only on one computer?
• Do any computers have connectivity?
• PING to what can and cant you PING?
• If a client cant connect to a server, can the
  host connect to that server?
• To resolve many problems either reconfigure the
  host, or uninstall and reinstall ICS on the host

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