{"id":949,"date":"2012-03-12T15:21:37","date_gmt":"2012-03-12T15:21:37","guid":{"rendered":"http:\/\/blog.designed79.co.uk\/?p=949"},"modified":"2012-03-18T07:12:04","modified_gmt":"2012-03-18T07:12:04","slug":"how-to-spoof-a-mac-address-on-the-mac-os-x-lion","status":"publish","type":"post","link":"https:\/\/blog.designed79.co.uk\/?p=949","title":{"rendered":"How to Spoof A MAC Address on Mac OS X Lion"},"content":{"rendered":"

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A MAC address is a unique identification number assigned to network interfaces, these can be attached to physical hardware like NIC and Wi-Fi cards or assigned to virtual machines. On some occasions, you\u2019ll need to change a MAC address to another ID.<\/p>\n

Get a New MAC Address<\/strong>
\nThe first thing you\u2019ll want to do is retrieve the intended MAC address. If you have one in mind then use that, but if you aren\u2019t trying to spoof a specific address and just need a\u00a0random<\/a>\u00a0one, use the following command to generate one with openssl:<\/p>\n

openssl rand -hex 6 | sed 's\/\\(..\\)\/\\1:\/g; s\/.$\/\/'<\/div><\/div>\n

MAC addresses are always in the format of xx:xx:xx:xx:xx:xx, yours must conform to this format in order to work. For the purpose of this walkthrough the randomly generated address of \u201cd4:33:a3:ed:f2:12 \u201d will be used.<\/p>\n

Changing the MAC Address<\/h2>\n

If you aren\u2019t in the Terminal yet, open it now. We\u2019ll use the interface en0 for this, but yours could be en1 (read notes at bottom). The command for changing the MAC address is as follows:<\/p>\n

sudo ifconfig en0 ether xx:xx:xx:xx:xx:xx<\/div><\/div>\n

Replace \u201cxx:xx:xx:xx:xx:xx\u201d with the desired MAC address, in the example case this will look like:<\/p>\n

sudo ifconfig en0 ether d4:33:a3:ed:f2:12<\/div><\/div>\n

Hit return and enter the administrators password to set the new address. To confirm it has been changed, type the following:<\/p>\n

ifconfig en0 |grep ether<\/div><\/div>\n

You can also\u00a0find it in Network preferences<\/a>, though the GUI doesn\u2019t always report the MAC change immediately, instead waiting until the network connection has been cycled.<\/p>\n

Notes & Troubleshooting<\/strong><\/p>\n