This worked for me:
Connect your iOS device by USB
$ rvictl -s UDID where UDID is the UDID of your device (located in XCode under Devices, shortcut to with ⇧⌘2)
$ sudo launchctl list com.apple.rpmuxd
$ sudo tcpdump -n -t -i rvi0 -q tcp or $ sudo tcpdump -i rvi0 -n
If victl is not working install Xcode and the developer tools.
For more info see Remote Virtual Interface and for the original tutorial here's the Use Your Loaf blog post
