incomplete lookup

[Marten Lehmann]

Hello,

I'm trying to lookup dns-entries for the domain name ecu.com.cn. For 
com.cn, trhe following nameservers are responsible:

sld-ns5.cnnic.net.cn
cns.cernet.net
sld-ns1.cnnic.net.cn
sld-ns2.cnnic.net.cn
sld-ns3.cnnic.net.cn
sld-ns4.cnnic.net.cn

Unfortunately, cns.cernet.net doesn't respond to queries. Usually, the 
resolver should use one of the other nameservers. But when I'm trying to 
lookup the domain name through a caching only BIND 9.2.3, I don't get 
any result. It seems, that BIND doesn't check the other nameservers. How 
can I verify this? Why doesn't BIND use the other nameservers if one of 
them fails?

dig @cns.cernet.net ecu.com.cn any

; <<>> DiG 9.2.1 <<>> @cns.cernet.net ecu.com.cn any
;; global options:  printcmd
;; connection timed out; no servers could be reached



  dig @sld-ns4.cnnic.net.cn ecu.com.cn any

; <<>> DiG 9.2.1 <<>> @sld-ns4.cnnic.net.cn ecu.com.cn any
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28494
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;ecu.com.cn.                    IN      ANY

;; AUTHORITY SECTION:
ecu.com.cn.             86400   IN      NS      ns.xinnet.cn.
ecu.com.cn.             86400   IN      NS      ns.xinnetdns.com.

;; Query time: 359 msec
;; SERVER: 61.145.114.119#53(sld-ns4.cnnic.net.cn)
;; WHEN: Mon Sep 13 11:50:43 2004
;; MSG SIZE  rcvd: 82



Regards
Marten