Mac OS X has a built-in command line utility that will allow us to configure the Airport card, but it’s not in an easy to access place. While we are waiting, let’s make a configuration change that will allow us to interact with the Airport card. When you launch Wireshark for the first time, it will need to configure a graphics utility named XQuartz in order to run, and that can take several minutes. The next step is to download Wireshark from Wireshark is a packet analysis tool–probably the best in the industry–and it has the added benefit of being free and open source! I’m using Wireshark version 1.10.6 on Mac OS X 10.9.3 (Mavericks) for this tutorial. Spoiler alert: they are pretty expensive! You can technically still get access to the same information with a Windows laptop, but you’ll need a third party device such as Riverbed’s AirPcap. Unfortunately, the vast majority of laptops natively running Windows won’t allow you to see layer 2 wireless information, as it is a restricted function of the NIC. The first step is to own a Macbook Air or Macbook Pro with an Airport card. Utilizing the Airport card we can gain access to some useful layer 2 wireless information including signal strength, channel frequency and data rate, and see interesting packets such as beacon frames as well. In this post, we are going to use the Airport NIC on a Macbook Pro or Air in order to view 802.11 and Radiotap headers using Wireshark.
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