Hi Niall,
Rather than false positives, doesn't that indicate a different kind of lameness -- of the delegation, rather than of the server?
Actually it depends on the test. If I interpret Anand's comment correctly, and only 1 query per name is made, then you'd only need one server to be slow or one packet to be lost (and isn't that what udp is for? :)) to become flagged as 'unresolvable'. But I'd like to believe that the DNS can do better than that. Besides, flagging too many nameserver as unresolvable means that the actual lameness test won't be performed, so the statistics could end up to be seriously tainted... Best, Gilles -- Fondation RESTENA - DNS-LU 6, rue Coudenhove-Kalergi L-1359 Luxembourg tel: (+352) 424409 fax: (+352) 422473