Strange iteration issue.

[William Stacey]

Looking at this for someone on another group and is now a vendetta.
Server is a w2k DNS server in "root-hints" mode with no forwarders
configured.  I'm not sure if this is a general DNS issue or an
implementation issue.  If latter, please forgive the question.

He is trying to ping www.suse.com using w2k DNS as recursive server.
w2k DNS
starts standard iteration as normal but starts looping trying to resolve
ns.suse.cz - because kerberos.suse.cz is replying with NS records
instead of
A record.  Is anyone else seeing the same thing?

TIA - below is my post to him.
---
This is strange - after doing a few NETMONs, we seem
to be stuck in a loop trying to resolve "ns.suse.cz" from 195.47.106.10.
kerberos.suse.cz
responds authoritively, but responds with a "go ask NS
kerberos.suse.cz".
So it does; again, and again, and again...  The server is looking for an
A
record answer to its query, but instead is getting authoritive NS
records
back to kerberos.suse.cz.  I have probably been looking at this too long
and
can not see the forest for the trees.

BTW - Running "E:\>dig @a.root-servers.net www.suse.com A +norec +trace"
does not
present the same issue.

The following shows what kerberos.suse.cz is returning when queried for
ns.suse.cz:

E:\>dig @195.47.106.10 ns.suse.cz A +norec

; <<>> DiG 9.2.1rc1 <<>> @195.47.106.10 ns.suse.cz A +norec
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41
;; flags: qr aa ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;ns.suse.cz.                    IN      A

;; ANSWER SECTION:
ns.suse.cz.             3600    IN      CNAME   kerberos.suse.cz.
kerberos.suse.cz.       3600    IN      A       195.47.106.10

;; AUTHORITY SECTION:
suse.cz.                3600    IN      NS      kerberos.suse.cz.
suse.cz.                3600    IN      NS      cthulhu.suse.cz.

;; ADDITIONAL SECTION:
kerberos.suse.cz.       3600    IN      A       195.47.106.10
cthulhu.suse.cz.        3600    IN      A       193.85.233.206

;; Query time: 300 msec
;; SERVER: 195.47.106.10#53(195.47.106.10)
;; WHEN: Fri Jun 14 10:47:38 2002
;; MSG SIZE  rcvd: 135


--
William Stacey, MCSE
Windows Server MVP