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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The help for the plugin says -
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">./check_dns --help<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">check_dns v1.4.15 (nagios-plugins 1.4.15)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Copyright (c) 1999 Ethan Galstad <nagios@nagios.org><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Copyright (c) 2000-2008 Nagios Plugin Development Team<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> <nagiosplug-devel@lists.sourceforge.net><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This plugin uses the nslookup program to obtain the IP address for the given host/domain query.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">An optional DNS server to use may be specified.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If no DNS server is specified, the default server(s) specified in /etc/resolv.conf will be used.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">(Based on your stated result(s), I must assume that if the "specified server" fails, it probably defaults to /etc/resolv.conf, but I'd probably have to fire
up wireshark/tshark to find out for sure)... <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">James<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Nibin V M [mailto:nibin.vm@piserve.com]
<br>
<b>Sent:</b> Monday, July 18, 2011 10:55 AM<br>
<b>To:</b> Nagios Users List<br>
<b>Subject:</b> [Nagios-users] DNS check - please help<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hello,<br>
<br>
I am a bit lost to find how the check_dns works. Please see the results below.<br>
<br>
# ./check_dns -H <a href="http://google.com">google.com</a> --server=myserver.<br>
DNS OK: 0.011 seconds response time. <a href="http://google.com">google.com</a> returns 74.125.93.103,74.125.93.104,74.125.93.105,74.125.93.106,74.125.93.147,74.125.93.99|time=0.011378s;;;0.000000<br>
<br clear="all">
# dig +short <a href="http://google.com">google.com</a> @myserver<br>
#<br>
<br>
I am sure that recursion isn't enabled on "myserver". Do the plugin try to resolve
<a href="http://google.com">google.com</a> using the name servers specified resolv.conf, if the -s server doesn't provide any answer?<br>
<br>
Thanks in advance.<br>
<br>
Regards,<br>
Nibin.<br>
---------------------------------<br>
Nibin.V.M<br>
Systems Integrator<br>
PiServe.com<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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