User manual APPLE DESIGNING AIRPORT EXTREME NETWORKS V3.4

[. . . ] Designing AirPort Extreme Networks © 2004 Apple Computer, Inc. All rights reserved. Apple, the Apple logo, AirPort, AppleShare, Apple Store, AppleTalk, Mac, and Mac OS are trademarks of Apple Computer, Inc. , registered in the U. S. Wi-Fi is a registered certification mark, and Wi-Fi Protected Access is a certification mark, of the Wi-Fi Alliance. 019-0152 1 Contents Chapter 1 5 6 6 7 7 7 8 8 9 11 13 14 15 15 16 17 19 20 20 21 27 48 62 63 65 65 68 69 Getting Started How AirPort Works How Wireless Internet Access Is Provided Configuring AirPort Extreme Base Station Internet Access AirPort Setup Assistant AirPort Admin Utility Extending the Range of Your AirPort Network Printing via an AirPort Extreme Base Station Sharing Your Computer's Internet Connection Network Basics Software Used for IP Networking in Mac OS X Software Used for AirPort Networking in Mac OS X AirPort Security Security for AirPort Networks at Home Security for AirPort Networks in Business and Education Wi-Fi Protected Access (WPA) AirPort Extreme Network Designs Using the AirPort Setup Assistant Using AirPort Admin Utility Setting Up the AirPort Network Configuring and Sharing Internet Access Setting Advanced Options Solving Problems More Information About AirPort Behind the Scenes Basic Networking Using the AirPort Extreme Base Station Items That Can Cause Interference With AirPort Chapter 2 Chapter 3 Chapter 4 Chapter 5 3 1 Getting Started 1 AirPort offers an easy and affordable way to provide wireless Internet access and networking anywhere in the home, classroom, or office. Instead of using traditional cables to create a network, AirPort uses wireless local area network (LAN) technology to provide wireless communication between computers. Through a wireless network you can access the Internet, share files, play multiplayer games, and more. [. . . ] Your IP addresses are delivered by the DHCP server. Your service provider may require you to enter information in these fields. 36 Chapter 4 AirPort Extreme Network Designs 6 If you chose "PPP over Ethernet (PPPoE)" from the "Connect using" pop-up menu, enter the PPPoE settings your service provider gave you. Leave the Service Name field blank unless your service provider requires a service name. Contact your ISP for the information to enter in the "DNS servers" and "Domain name" fields. Note: With AirPort, you don't need to use a third-party PPPoE connection application. You can connect to the Internet using AirPort. Contact your service provider for the information you should enter in these fields. If you are connecting to the Internet through a router using PPPoE and your base station is connected to the router via Ethernet, you do not need to use PPPoE on your base station. Choose Ethernet from the "Connect using" pop-up menu in the Internet pane, and deselect the "Distribute IP addresses" checkbox in the Network pane. Chapter 4 AirPort Extreme Network Designs 37 7 Click the Network button and configure how the base station will share its Internet access with AirPort and Ethernet computers. · To share a single Internet connection with AirPort computers, make sure "Distribute · · · · · IP addresses" and "Share a single IP address (using DHCP and NAT)" are selected. If you have been given a range of public IP addresses by your ISP, you can select the "Share a range of IP addresses (using only DHCP)" option. If you want to connect an AppleTalk Ethernet printer to the base station or use AppleTalk between wired and wireless computers, make sure the devices are connected to the Ethernet LAN (G) port on the base station. Ethernet computers connected to the Ethernet LAN (G) port share Internet access and a single IP address (using NAT). Enabling NAT lets you share a single Internet connection among several computers. Enabling DHCP lets the base station dynamically and automatically assign IP addresses to client computers, which simplifies each computer's TCP/IP configuration. By default, the base station allows devices and computers using Ethernet and computers using AirPort to communicate with one another using non-IP protocols like AppleTalk. If you want to use the parental controls you have set up with your America Online (AOL) account, select the "Enable AOL parental controls" checkbox. If you want people joining your AirPort network to be greeted with a personal message, type it in the Message field. 38 Chapter 4 AirPort Extreme Network Designs · If your base station has an internal modem, select "Enable PPP Dial-in" to allow you to dial in to the AirPort Extreme Base Station from a computer modem over a standard, analog phone line. Dialing in to your base station gives you access to your home network and the Internet through your home network Internet service provider (ISP). To set up your base station for PPP dial-in: a Connect a phone line to the modem (W) port on your base station. b In the Network pane of AirPort Admin Utility, select "Enable PPP Dial-in" and click Configure. Because you set the base station to answer incoming calls, consider using a dedicated phone line for your base station. Other calls coming in on the same line could cause the base station modem to disconnect. You cannot enable PPP dial-in if the base station is set up to use a PPP connection to your Internet service provider. With PPP dial-in enabled, the base station is set to share a single IP address (using DHCP and NAT) only; it cannot share a range of IP addresses (using only DHCP). Note: If you dial in to your base station from a V. 90 modem, the best speed you can expect is the V. 34 speed of 33600 bits per second (bps). [. . . ] NAT (Network Address Translation) NAT is used to share one IP address among several computers. A device set up as a NAT router uses a collection of "private" IP addresses (in the range 10. 0. 1. 2 to 10. 0. 1. 200) to allow several computers to access the Internet using one "public" IP address. When a computer using a private IP address requests information from the Internet, the NAT router keeps a record of the computer making the request, and sends the information to the Internet using its own IP address. When the response comes back from the Internet, the NAT router forwards the packet to the appropriate computer. [. . . ]