birt barcode generator Figure 9-10. Identifying your MAC address in Font

Generator QR-Code in Font Figure 9-10. Identifying your MAC address

Figure 9-10. Identifying your MAC address
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CHAPTER 9 SE CURING A WIRE LESS NETWORK
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Note We suggest writing down all the AirPort IDs on your network before beginning this process and
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adding them during the initial setup of the AirPort.
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Once the AirPort IDs have been assembled, enable MAC filtration on the AirPort by opening the AirPort Utility and clicking the AirPort icon in the toolbar. Then select the Access Control tab, and set the MAC Address Access Control feature to Local (see Figure 9-11).
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Figure 9-11. MAC address access controls
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Note RADIUS requires Mac OS X Server to be configured in a Mac environment.
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Before clicking Update, make sure to add the computers you want to give access to on the wireless network. To add a computer, click the + sign at the bottom of the screen. Now type the AirPort ID of the computer that will be accessing the wireless network. If you want to limit which machines can access the wireless network, then you can click the + sign. As you can see in Figure 9-12, this opens a screen allowing you to enter the MAC address of the AirPort card (or other wireless adapter). If you are using MAC addresses, only the systems listed will be able to join the wireless network.
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Caution If the computer configuring the MAC filtering is not configured, once Update is clicked, that computer
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will not be able to tap back into the wireless network and will need to use a wired computer for access.
Figure 9-12. Using the MAC address
AirPort Logging
The AirPort does not keep logs for an indefinite amount of time. For longer log retention, an OS X Server should be configured with the syslog service option to keep AirPort logs long-term. Syslog is a built-in configurable service of OS X Server. To enable the syslog function of OS X Server, click the Advanced button in the toolbar of the AirPort Utility. Then, click the Logging & SNMP tab (see Figure 9-13), and enter the IP address for the syslog OS X Server. Choose the level of alerts that are sent to the server using the Syslog Level drop-down list.
Figure 9-13. Enabling logging
CHAPTER 9 SE CURING A WIRE LESS NETWORK
Note If a syslog server is not available, you can still click the Logs and Statistics button to review logs.
However, the AirPort will erase these log files the next time it loses power or is reset.
Hiding a Wireless Network
Another good measure to protect an Apple wireless network is to hide the SSID of the network, also known as SSID suppression, which will cause the wireless network to not show up in the list of available networks for users. If fewer people can discover a wireless network, it is less likely to be hijacked and abused. This isn t to say that hiding the SSID makes the network completely undiscoverable. Later in this chapter, we will discuss tools such as KisMAC and iStumbler that will allow those who wardrive to see networks even when the SSID has been suppressed. SSID suppression is a good mechanism for security, but only when used in conjunction with other security measures. To suppress the SSID for your Apple AirPort, click the Wireless tab for your AirPort, and then click the Wireless Options button. This opens a screen similar to Figure 9-14, which allows you to click Create a Closed Network. An AirPort environment with the SSID suppressed is synonymous with a closed network in Apple terminology.
Note Wardriving is the act of searching for wireless networks by a person in a moving vehicle using a
computer or a PDA to detect the networks and possibly break into them.
Figure 9-14. Creating a closed network
C H APT ER 9 SEC URIN G A WI RELES S NET WO RK
Base Station Features in the AirPort Utility
Every Apple computer comes with a utility to manage Apple AirPorts. This means that every Mac on your network has the ability to configure your AirPorts, which is dangerous. But imagine if every Apple computer on the Internet were able to configure your AirPort. If you select the Allow Configuration Over Ethernet WAN Port box (see Figure 9-15), then this is exactly what you are doing. Do not use this feature unless you have to use it. If it is absolutely necessary to allow administration over the Ethernet, make sure to put an administrative password on the AirPort and give the password only to those who absolutely need it.
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