> Its important to note a point entioned here that vendors are building > boxes to do this as well. I ran a 3dns pair for a while and wow the > mail that came in from people with firewalls or simply watching for > probes. F5 was opening all sorts of half opened connections and wierd > ports other than ones involving dns. I believed they called it iquerry.
draft-ietf-dnsext-obsolete-iquery-03.txt randy
