Apple’s release of an AirPort Utility app for iOS 5 lets you leave the desktop version behind for most base station configuration tasks. It’s free, and has the bonus of a graphic presentation of your network layout and connections among base stations. Glenn Fleishman has the details at Macworld. follow link
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Use the New AirPort Utility App for iOS 5
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Read real-world advice from Wi-Fi wizard Glenn Fleishman on setting up a wireless network using Apple's 802.11n and 802.11ac base stations. Learn to maximize performance, extend range, connect multiple base stations, handle complex configs, share USB disks and printers, and more.