Apple AirPort Networks Anleitung zur Fehlerbehebung PDF herunterladen (Seite 52)

Frequency

10.7 Lion was the first release of Mac OS X that allows you to select

either a 2.4 GHz or 5 GHz channel for use with a software base station.

You can pick any 2.4 GHz channel, as well as 5 GHz channels 36, 40,

44, and 48. (These channels vary by country.) Apple is offering only 4

of the 8 channels available in its dedicated base stations, which are just

8 of the 23 legal channels in the United States. These lower-numbered

channels (36, 40, 44, and 48) broadcast at no more than 5 percent of

the maximum legal power of the higher-numbered channels according

to U.S. rules. Apple must have thought it better to use lower power and

thus not interfere with any nearby networks (read

Channels for more ).

Security

After years of providing lackluster security for the software base

station, Apple finally upgraded it with the release of 10.8 Mountain

Lion (and didn’t advertise the fact). Mountain Lion offers WPA2

Personal security, which provides the highest degree of security

available. WPA2 Personal replaced the older WEP encryption, which

I described back in

Use Built-in Encryption, in 2004. (WEP remains

the only option in L

ion, however.)

The other advantage of WPA2 Personal is that it’s compatible with

802.11n as well as with 802.

11ac. WEP can work only with 802.11g

(2.4 GHz) and 802.11a (5 GHz), thus reducing your software base

station’s throughput.

In Mountain Lion and later, as you follow the steps ahead for turning

on a software base

station, you’ll be able to choose None or WPA2

Personal as the security method. None will let anyone join, of course,

while WPA2 Personal requires that other devices have the passphrase

you set. Nearly every piece of hardware labeled “Wi-Fi” shipped since

2004 (and some from 2003) can work with WPA2 Personal security.

178

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Apple AirPort Networks Anleitung zur Fehlerbehebung Seite 52