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Chapter 26. Sharing an Internet Connecti... > Using a Hardware DHCP Server to Shar... - Pg. 560

Sharing an Internet Connection 1. 2. 560 3. 4. 5. Contact your ISP to determine whether this option is available. If it is, obtain additional addresses (or DHCP names); you will need one address for each ma- chine or device (such as an AirPort Base Station) that you want to share the account. You will probably need to pay an additional fee for each IP address that you obtain. Connect the cable or DSL modem to the WAN port on the hub for your network. Connect each device to a LAN port on the hub. Configure each machine with one of the available addresses (or DHCP names). Note If you can't use a device on your network because of an error message about the same IP address being used on more than one device, see "I Get an Error Message Telling Me That Multiple Devices Have the Same IP Address " in the Troubleshooting section at the end of this chapter. One advantage to this method is that you can use a standard Ethernet hub to facilitate sharing the account; these hubs are quite inexpensive and are simple to install and use. And setting up each device to use its address is straightforward as well. You simply configure each machine as if it were the only one using the account. Another advantage is that you get maximum speed for each machine because each connects directly to the account; the traffic doesn't have to be managed by a DHCP server on your network. And, because there isn't any software on your network that has to manage the Internet traffic, as a DHCP server does, your connection for each device is only dependent on your modem and service, making it more reliable than some of the other methods. One possible disadvantage is that might you have to pay an additional fee for each address that you use. The typical cost of additional addresses is $5 to $7 per month per address on top of the address included with your base account. This can get expensive if you have several devices on your network; however, you can balance that cost against not needing a hub (Ethernet or AirPort) that has Internet account sharing built in. Another disadvantage is that you don't get any special features, such as a built-in firewall. You will have to add protection for your network in some other way. For help choosing and installing an Ethernet hub, see "Finding and Installing an Ethernet Hub," p. 608. For help installing and configuring a network, see Chapter 25, "Building and Using a Local Area Network," p. 619. For help with protecting your Mac from Net attacks, see "Defending Your Mac from Net At- tacks," p. 686. Using a Hardware DHCP Server to Share an Internet Account One of the best ways to share an Internet account is to use a hub device that provides DCHP services to the network. These devices have the DHCP software built in and handle the adminis- tration of IP addresses for the network automatically. In addition to basic DHCP services, some of these devices also include special features, such as built-in firewall protection for your network. The general steps for installing and using such a device are the following: