Quick DNS perfromance measurement trick

[Michael ODonnell]

I tried the specified command from three different sites and
they all gave essentially identical responses:

   "aaa.bbb.ccc.ddd is POOR: 26 queries in 3.1 seconds from 1 ports with std dev 0.00"

That aaa.bbb.ccc.ddd address seems to be the (possibly NAT'd) IP
addr that the target site sees mentioned in the inbound packets;
I have no idea about the rest of it...