Wireshark is killer, except when it doesn’t play well with the underlying OS.  Like how OS X finds it hilarious to hide your network interfaces from your applications.  Go ahead, fire up Wireshark on the mac and watch as it can’t find a single interface.  I’ll wait.

Yeah, pain, isn’t it?

Well, you can fix that:

sudo chmod 664 /dev/b*

And you’re back in action.