parent dns answers the ARR of child dns

[Tech W.]

Hello,

Firstly thanks for any helps I have got on this list for our DNS setup in university environment.

Now I meet another problem, please see this dig:

# dig smartip.gduf.edu.cn ns +short
dtone1.gduf.edu.cn.

That means smartip.gduf.edu.cn is a zone whose NS is dtone1.gduf.edu.cn.


I have setuped the www ARR in this zone, ie,

# dig www.smartip.gduf.edu.cn  +short
121.8.235.88


That seems correct, and www.smartip.gduf.edu.cn should be responsed by dtone1.gduf.edu.cn. 


OK after that I dig with trace:

# dig www.smartip.gduf.edu.cn +trace 

; <<>> DiG 9.5.0-P2 <<>> www.smartip.gduf.edu.cn +trace
;; global options:  printcmd
.                       475868  IN      NS      F.ROOT-SERVERS.NET.
.                       475868  IN      NS      E.ROOT-SERVERS.NET.
.                       475868  IN      NS      D.ROOT-SERVERS.NET.
.                       475868  IN      NS      M.ROOT-SERVERS.NET.
.                       475868  IN      NS      L.ROOT-SERVERS.NET.
.                       475868  IN      NS      J.ROOT-SERVERS.NET.
.                       475868  IN      NS      C.ROOT-SERVERS.NET.
.                       475868  IN      NS      H.ROOT-SERVERS.NET.
.                       475868  IN      NS      A.ROOT-SERVERS.NET.
.                       475868  IN      NS      K.ROOT-SERVERS.NET.
.                       475868  IN      NS      I.ROOT-SERVERS.NET.
.                       475868  IN      NS      B.ROOT-SERVERS.NET.
.                       475868  IN      NS      G.ROOT-SERVERS.NET.
;; Received 512 bytes from 202.96.128.86#53(202.96.128.86) in 4 ms

cn.                     172800  IN      NS      B.DNS.cn.
cn.                     172800  IN      NS      NS.CERNET.NET.
cn.                     172800  IN      NS      A.DNS.cn.
cn.                     172800  IN      NS      E.DNS.cn.
cn.                     172800  IN      NS      C.DNS.cn.
cn.                     172800  IN      NS      D.DNS.cn.
;; Received 304 bytes from 198.41.0.4#53(A.ROOT-SERVERS.NET) in 165 ms

edu.cn.                 172800  IN      NS      ns2.cernet.net.
edu.cn.                 172800  IN      NS      dns2.edu.cn.
edu.cn.                 172800  IN      NS      deneb.dfn.de.
edu.cn.                 172800  IN      NS      dns.edu.cn.
edu.cn.                 172800  IN      NS      ns2.cuhk.hk.
;; Received 189 bytes from 203.119.28.1#53(D.DNS.cn) in 243 ms

gduf.edu.cn.            172800  IN      NS      OAR.gduf.edu.cn.
gduf.edu.cn.            172800  IN      NS      DNS.gduf.edu.cn.
;; Received 109 bytes from 137.189.6.21#53(ns2.cuhk.hk) in 29 ms

www.smartip.gduf.edu.cn. 8      IN      A       218.192.12.4
www.smartip.gduf.edu.cn. 8      IN      A       218.192.12.10
www.smartip.gduf.edu.cn. 8      IN      A       218.192.12.3
;; Received 89 bytes from 218.192.12.6#53(DNS.gduf.edu.cn) in 106 ms



Please see above info, www.smartip.gduf.edu.cn is now responsed by gduf.edu.cn's auth-DNS directly (dns.gduf.edu.cn), not by dtone1.gduf.edu.cn (the child zone's dns). But what I want is that it should be answered by the dns of the child zone.

Why this happens and how to fixup it?
Please help, thank you.

Regards,
Wah.



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