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10.7: Monitor your Wi-Fi with Wi-Fi Diagnostics Network
Lion ships with an app called Wi-Fi diagnostics. It allows you to monitor Wi-Fi networks your computer is connected to and collect various kinds of information. This utility could be very useful for finding problems or doing research on your Wi-Fi networks.

The easiest way to launch Wi-Fi Diagnostics is to open it directly from the location /System/Library/CoreServices.

Once it launches, you get some options to choose from. As an example, let's use the first, Monitor Performance. Select that and click Continue.

You are given a live-updating graph of the signal/noise ratio of your network. This could be useful for live testing to find problems with interference. For example, turn on your coordless phone and see if your ratio worsens. If it does, move your router farther away from the phone.

The other options are also useful, allowing you to log events like people connecting and disconnecting, and allowing you to sample raw data sent across the network.

[crarko adds: A good utility to have, with some very powerful capabilities. Use it responsibly, and also take it as a reminder not to send private data over unencrypted connections, because there are plenty of programs which can snoop open Wi-Fi networks.]
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10.7: Monitor your Wi-Fi with Wi-Fi Diagnostics
Authored by: Jai Gill on Aug 24, '11 05:02:31PM

I haven't used this utility yet... however, will it allow me to check what devices are logged on? Particularly when a WiFi network had been created using a MBP as a means to connect an iPad.

I do this so I may use the Keynote Remote app on my iPad to flip Keynote slides on my MBP which is connected to a data projector. While the WiFi network I create is always password protected, I do feel that some utility is required to establish what devices are connected over WiFi....


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10.7: Monitor your Wi-Fi with Wi-Fi Diagnostics
Authored by: NogbadTheBad on Sep 05, '11 11:43:51AM

There are some limitations with this hint if you're using an older Mac, specifically with older network hardware. I can't say for sure which ones work and which ones don't. But my 2008 MacPro doesn't let you select "Monitor Performance"; my 2010 Air does just fine. I hear that a similar difference in hardware may also account for AirDrop being disabled on older Macs.

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