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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 • 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 • 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 Printer Scanner WebCam Hub • Internet • Universal Plug and Play
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 • 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 Topology ICS Client 1 Modem ICS Host Hub Internet ICS Client 2
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 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 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 • 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 • 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 Internet ICS Client hub Internet ICS Host If a client establishes the tunnel ICS Client
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 • Cabling • Utilities using the phone line for meters • Extensions versus separate lines for voice
Other Caveats • Multiplayer games • Secure sites • Customized sites
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