User manual APPLE DESIGNING AIRPORT NETWORKS

[. . . ] Designing AirPort Networks 1 Contents Chapter 1 5 6 6 7 7 8 8 9 9 10 13 15 16 17 17 18 19 21 22 22 23 29 48 62 63 65 75 Getting Started How AirPort Works How Wireless Internet Access Is Provided Configuring the AirPort Extreme Base Station and AirPort Express for Internet Access AirPort Setup Assistant AirPort Admin Utility Extending the Range of Your AirPort Network AirTunes Printing via an AirPort Extreme Base Station or AirPort Express 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 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 Using AirPort Express Behind the Scenes Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 3 1 Getting Started 1 AirPort offers the easiest way to provide wireless Internet access and networking anywhere in the home, classroom, or office. Instead of using cables to create a network, AirPort uses wireless local area network (WLAN) technology to provide wireless communication between computers. Through a wireless network you can access the Internet, share files, play multiplayer games, and more. If you have an AirPort Express and use AirPort 4. 0 or later, you can play iTunes music through remote speakers using AirTunes. Note: This document contains information about AirPort and detailed information about designing AirPort networks using AirPort Extreme. [. . . ] 6 If you want to adjust optional advanced settings, go to "Setting Advanced Options" on page 48. When the transfer is complete, the base station restarts and its new settings are active. Setting Up Client Computers To configure TCP/IP on client computers: 1 Open System Preferences on the client computer and click Network. 2 For AirPort clients, choose AirPort from the Show pop-up menu and Using DHCP from the Configure IPv4 pop-up menu in the TCP/IP pane. For Ethernet clients, choose Built-in Ethernet from the Show pop-up menu and Using DHCP from the Configure IPv4 pop-up menu in the TCP/IP pane. Joining an AirPort Network To join your AirPort network, clients can choose the network from the AirPort status menu in the menu bar. 42 Chapter 4 AirPort Network Designs You're Using a Dial-Up Internet Service Provider (ISP) If your AirPort Extreme Base Station came with an internal modem, you can set up its connection to the Internet with the AirPort Setup Assistant. You only need to use AirPort Admin Utility to adjust optional advanced base station settings, such as port mapping, advanced security options, or controlling access to your AirPort network. What It Looks Like AirPort Extreme Base Station W Phone jack (to the Internet) How It Works · The base station connects to your ISP and the Internet using its internal modem. · Computers using AirPort or computers connected to the base station's Ethernet LAN (G) port can connect to the Internet through the AirPort Extreme Base Station. · AirPort computers and Ethernet computers communicate with one another through the base station using AppleTalk and other networking protocols. Chapter 4 AirPort Network Designs 43 What You Need for a Dial-Up Connection Components Working dial-up ISP account using standard PPP Check Make sure you have the following: · ISP phone number · account name and password · DNS address · other information your ISP may provide Comments You can get this information (except the account password) from the Internet Connect application and Network preferences on the computer you use to access the Internet. If Network preferences on your computer doesn't have DNS information, you may not need to provide DNS information in the AirPort Setup Assistant. If you want to add more than one computer to your network using Ethernet, you need an Ethernet hub. AirPort Extreme Base Station with an internal modem Optional Ethernet hub What to Do If you are using the AirPort Setup Assistant to configure the AirPort Extreme Base Station for Internet access: 1 Open the AirPort Setup Assistant, located in Applications/Utilities. 2 Follow the onscreen instructions and enter the phone number and other account information for your ISP. 44 Chapter 4 AirPort Network Designs If you are using AirPort Admin Utility to configure the AirPort Extreme Base Station or AirPort Express for Internet access: 1 Open AirPort Admin Utility, located in Applications/Utilities. 2 Click Internet and choose Modem (V. 90) from the "Connect using" pop-up menu if you are connecting to an ISP. The "DNS servers" and "Domain name" information may be optional; check with your ISP. Contact your ISP for the information you should enter in these fields. If you have difficulty connecting, you can try to connect at a slower modem speed by choosing Modem (V. 34) from the "Connect using" pop-up menu. Chapter 4 AirPort Network Designs 45 3 Click Network and configure how the base station will share its Internet access with AirPort and Ethernet computers. Select the "Distribute IP addresses" checkbox and the "Share a single IP address (using DHCP and NAT)" button. By default, AirPort and Ethernet client computers share a single IP address using Network Address Translation (NAT). The base station acts as a bridge between the AirPort and local Ethernet networks. When Modem is selected in the "Connect using" pop-up menu in the Internet pane, both the Ethernet LAN (G) port and the Ethernet WAN ( ) port are bridged, and both can share a single IP address using NAT. Important: If you are connecting to the Internet by Ethernet or PPPoE, only the Ethernet LAN (G) port is bridged. 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. Bridging allows devices and computers using Ethernet and computers using AirPort to communicate with one another. Note: If your base station can use Power over Ethernet and receive power and the network connection on the WAN port, by default NAT is not enabled. [. . . ] The AirPort Extreme Base Station has five hardware networking interfaces: · AirPort interface The AirPort interface creates an AirPort network for AirPortequipped computers to join. The base station can provide IP services like DHCP and NAT over this interface. The base station cannot use the AirPort interface to establish a connection with the Internet. · Modem (W) interface The modem interface is used to establish PPP connections to the Internet. [. . . ]