In message <4591889.164031259808158905.javamail.corem...@app183.163.com>, lipen g967 writes: > 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 .
Nslookup does normal queries into the .ARPA namespace to do "reverse" lookups. Inverse lookups were a concept that really only worked in the "dentist surgery" senario (one server providing the entire DNS view). Inverse queries were deprecated years ago <http://www.ietf.org/rfc/rfc3425.txt>. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users