Sniff Wi-Fi

It's a rough world out there, folks.  The economy stinks (or, is great if you live in western North Dakota), finding love is harder than ever (or, easier than ever if you use online dating) and WiFi bandwidth is scarce (or, plentiful if you use the 5 GHz band).  Into this quagmire wades the Google Chromecast.  A cheap ($35 USD), little (about the size of an e-cigarette case) gadget that allows you to mirror your smartphone/tablet/computer screen to your television.  If you want to feel like a member of the 1% (at least, the top 1% of WiFi spectrum consumers), this is the gadget for you. Reviews, tutorials and takes on Google's Chromecast are plentiful, so let's skip that.  On this blog we don't care whether people like the gadget.  We care about what the gadget does to the WiFi.  Does it suck up bandwidth?  Is it chatty during down times?  Does it interfere with existing networks? Let's take the first question last ( Charles Van Doren v...

As long time readers of this blog might know, WildPackets OmniPeek has been my favorite WiFi sniffer for nearly a decade.  Then I found out about WildPackets' OmniWiFi 3-stream 802.11n USB adapter and I fell even more in love.  Now I learn that OmniPeek 7.5 has added wireless features to the Compass screen.  A good product has been made better (though time will tell if it lasts). First, OmniWiFi: The fact that different 802.11n devices have different capabilities is one of those things that sometimes flies under the radar.  The standard may say 600 Mbps, but just on the Apple website one can buy 802.11n devices with maximum rates of 65 Mbps (iPhone 4S), 150 Mbps (iPad Mini), 300 Mbps (Macbook Air 2012) and 450 Mbps (Macbook Pro 2012). 450 Mbps WiFi devices are the ones that give WiFi pros trouble because so many sniffing tools fail to capture 450 Mbps traffic.  The popular (at least with Wireshark devotees) AirPcap NX from Riverbed, the beloved (at least b...