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. [. . . ] 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. 4 If you want to adjust optional advanced settings, go to "Setting Advanced Options" on page 48. If you are finished changing settings, click the Update button. Your computer transfers the new settings to the base station. When the transfer is complete, the base station restarts and its new settings are active. 46 Chapter 4 AirPort Network Designs Setting Up Client Computers See "Setting Up Client Computers" on page 35 for information on setting up client computers to access the AirPort network. You're Using AirPort Extreme Base Stations Powered Over Ethernet on an Existing Network If your AirPort Extreme Base Station supports it, you can connect multiple base stations to 802. 3af-compliant Power Sourcing Equipment (PSE), and deliver both power and the network and Internet connection over the same cable. See the documentation that came with your base station to make sure the base station supports Power over Ethernet (PoE). If your base station supports PoE, the base station and the mounting bracket conform to UL Standard 2043 for placement in the air-handling space above suspended ceilings. Using Power over Ethernet allows you to install a base station in places away from a standard electrical outlet. To use the base station in an air-handling space above suspended ceilings, you must connect the Ethernet WAN port to an 802. 3af-compliant PSE with a plenum-rated Ethernet cable. You cannot use the AC power adapter to power a base station installed in an air-handling space. Do not connect an external antenna to a base station mounted in an air-handling space. What It Looks Like AirPort Extreme Base Stations AC power outlet To Network 802. 3af-compliant Power Sourcing Equipment (PSE) Plenum-rated Ethernet cables Chapter 4 AirPort Network Designs 47 How It Works · The base station uses your Ethernet network to communicate with the Internet and receives power through the Ethernet WAN ( ) port. · AirPort clients access the Internet and the Ethernet network through the AirPort Extreme Base Station. Note: AirPort Extreme Base Stations that support Power over Ethernet (PoE), are set up by default to act as a bridge, and the "Share a single IP address (using DHCP & NAT)" option is not selected. [. . . ] · Modem (W) interface The modem interface is used to establish PPP connections to the Internet. These connections provide IP services to the base station. (Available on some models. ) · Ethernet WAN ( ) interface The Ethernet WAN interface is used to connect DSL or cable modems and connect to the Internet. · Ethernet LAN (G) interface The Ethernet LAN interface provides IP services to local Ethernet clients. [. . . ]