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You get a CR-48 in the mail. You want to use it but the wireless network only allows access to specified MAC addresses. How do you determine the MAC address?

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Since you have access to the network configuration (to allow your new device), turn off MAC filtering for a minute, connect, and sift through the list of connected devices, get the MAC, add it to the list of allowed devices, and re-enable filtering. – Daniel Beck♦ Dec 21 '10 at 20:41

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Type:

chrome:///system

Look for 'ifconfig' and select expand. You'll see 'wlan0'. 'HWaddr' is the MAC address.

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Looks like this may or may not work if you're disconnected: code.google.com/p/chromium-os/issues/detail?id=10032 – Shinrai Dec 21 '10 at 20:42
Good catch Shinrai. – ngen Dec 21 '10 at 20:45
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In what is probably a more recent development since you originally asked this question, you can see the MAC from the settings pop-up in the lower right corner. Click the clock, then on "Connected to [SSID]". In the lowest right-hand corner of that popup is an "i" button that looks like a stop sign with the hover text "Network Info". Clicking on it reveals the IP and MAC.

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