inverse query:PTR RR or OPCODE=1 ?

[lipeng967]

  when I read the RFC1035, I noticed the opcode defination in the DNS message head . It said that when opcode = 1 the message did Inverse query . but in the packet  I capatured when I used nslookup to do inverse query ,the inverse query packet use the opcode = 0 and the question segment with RR TYPE PTR. Can someone explain this ?  Am I wrong about understanding the inverse query ? Thank a lot .
     



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