Troubleshooting

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The Machines with Which I Am Sharing a Connection from My Mac Can't Connect at All

I have started Internet Sharing on a Mac, but other devices on the network can't access the Internet.

Attempt to connect to the Internet from the Mac that is sharing the account. If that machine can't connect, something has happened to its Internet connection. If that machine can connect, check that Internet Sharing is configured properly.

Then, check the Internet connection settings for each machine to make sure they are set to connect via a DHCP server.

To learn how to connect a Mac to the Internet, see Chapter 10, "Connecting Your Mac to the Internet," p. 263.


To learn how to configure Internet Sharing, see "Configuring the DHCP Mac to Share an Account," p. 859.


The Machines with Which I Am Sharing a Connection from My Mac Have Lost Internet Access

The machines with which I am sharing an Internet connection were able to connect, but now they can't.

First, check whether all the machines with which the connection is being shared have this problem or only some do. If all the machines are unable to connect, the problem stems from the Mac sharing the account (see the next paragraph). If some of the machines with which the connection is being shared can access the Net, the problem lies with those machines. Check the configuration of those machines to ensure that they are configured to use a DHCP server. Also, check their network connections to make sure they are communicating with the network properly.

To learn how to connect a Mac to the Internet, see Chapter 10, "Connecting Your Mac to the Internet," p. 263.


To learn how to install, configure, and use an AirPort network, see Chapter 11, "Using an AirPort Network to Connect to the Internet," p. 297.


To learn how to build and manage a network, see Chapter 26, "Building and Using a Network," p. 821.


If none of the machines can access the Internet, something has happened to the Mac that is sharing the connection.

Make sure that the Mac is still running and that sleep is disabled. If both of these conditions are true, move to the next paragraph. If the Mac is shut down, restart it and restart Internet Sharing. If the Mac has gone to sleep, you need to wake it up and restart Internet Sharing.

Attempt to connect to the Internet from the Mac that is sharing the account. If that machine can't connect, something has happened to its Internet connection. If that machine can connect, reconfigure Internet Sharing.

To learn how to configure sleep, see "Managing Your Mobile Mac's Power," p. 982.


To learn how to connect a Mac to the Internet, see Chapter 10, "Connecting Your Mac to the Internet," p. 263.


To learn how to configure Internet Sharing, see "Configuring the DHCP Mac to Share an Account," p. 859.


I Get an Error Message Telling Me That Multiple Devices Have the Same IP Address

When I attempt to start up one of the devices on my network, I see an alert stating that a device has already been assigned the IP address and that IP services are being shut down. How do I correct this problem?

Two devices on the same network cannot have the same IP address. If you start up one device and see this error message, you have two or more devices trying to use the same address. Check the configuration of each device to see which devices are using that address (for Mac OS X machines, use the TCP/IP tab of the Network pane of the System Preferences utility to see how the computer is configured). Check that each device has a unique address, including an AirPort base station or other device that is sharing the account.

Occasionally, your hub will "remember" the devices that are using specific IP addresses and you will see this error even though you made sure that each device had a unique address. If this happens, power down your entire network, including the hub and all other devices attached to it. Wait a few seconds and power up everything again. The error should be cleared as each device registers its unique address on the network.



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