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Internet Connection Sharing Hugh Taylor Support Professional Platforms Support Microsoft Corporation

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Internet Connection Sharing Hugh Taylor Support Professional Platforms Support Microsoft Corporation. Overview. Benefits of home networking Topology of Internet Connection Sharing (ICS) How ICS works

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Internet Connection SharingHugh TaylorSupport ProfessionalPlatforms SupportMicrosoft Corporation

overview
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
benefits of home networking
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
anatomy of a home lan
Anatomy of a Home LAN

Printer

Scanner

WebCam

Hub

  • Internet
  • Universal Plug and Play
benefits of ics
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
general topology
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
general topology7
General Topology

ICS Client 1

Modem

ICS Host

Hub

Internet

ICS Client 2

how network address translation works
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
how port mapping works
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

how host forwarding works
How Host Forwarding Works

Port Map:

X = 2958

Y = 3256

Z = 4223

to Microsoft.com from port 3256

  • 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

from Microsoft.com to port 3256

to Yahoo.com from port 4223

Internet

from Yahoo.com to port 4223

ICS Host

setup caveats tips and issues
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
networking caveats tips and issues
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?
networking vpn and ics
Networking: VPN and ICS

Internet

ICS Client

hub

Internet

ICS Host

If a client establishes the tunnel

ICS Client

networking vpn and ics 2
Networking: VPN and ICS (2)

To VPN

Server

ICS Client

hub

ICS Host

Internet

If the host establishes the tunnel

ICS Client

phone line networking
Phone Line Networking
  • Cabling
  • Utilities using the phone line for meters
  • Extensions versus separate lines for voice
other caveats
Other Caveats
  • Multiplayer games
  • Secure sites
  • Customized sites
basic troubleshooting
Basic Troubleshooting
  • Host only on one computer?
  • Do any computers have connectivity?
  • PING – to what can and can’t you PING?
  • If a client can’t 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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