Hello experts

i am new to suse , i have installed sles11 sp3 recently to use it as a test machine of oracle RAC , unfortunately i have issue with my DNS server as below
1- DNS installed successfully and i was able to nslookup
rac01:/var/lib/named/master # service named statusChecking for nameserver BIND
version: 9.6-ESV-R7-P4
CPUs found: 1
worker threads: 1
number of zones: 19
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/0/1000
tcp clients: 0/100
server is up and running

2- nslookup out put

nslookup rac-scan

Name: rac-scan.localdomain
Name: rac-scan.localdomain
Name: rac-scan.localdomain

3- able to reverse loockup

Address: name = rac01.localdomain.

4- the issue is when trying to nslookup for unknown host

nslookup unkown-host
;; connection timed out; no servers could be reached

as you can see this is not normal output , normal output should looks like

*** Unknown can't find hostname: Non-Existent domain

this issue prevents oracle clusterway installation , please help me get red of this issue .

Thank you
Samir Aly