On Sat, Nov 07, 2009 at 11:01:07AM +0000, Andras Salamon <andras@dns.net> wrote a message of 21 lines which said: > 2. the cache contains an authoritative entry for type X, > 3. the cache contains an NXDOMAIN entry for type Y? I don't understand. 2) and 3 cannot be true at the same time.