Appendix B. Setting up a Software Base Station
You can use a computer equipped with a Wi-Fi adapter card not just as a client on a Wi-Fi network, but also as a base station. This appendix explains how to set up a software base station under Mac OS X.
Apple’s software base station has two distinct problems:
Security: You can use only WEP encryption, which I describe back in Use Built-in Encryption as a last-resort method of security. It’s definitely better than nothing, however.
Frequency: Even though 802.11n allows the use of the uncrowded 5 GHz band for less interference and better throughput, Internet sharing over AirPort works just with the busy 2.4 GHz band.
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