It looks like you use parent-child-relationships?<br>That would explain why it's written "Host Unreachable (172.21.10.170) " instead of Host Down. <br>Was the parent of this host down as well? In this case, Nagios 'knows' that it doesn't make sense to continue checks on the child hosts.<br>
<br><div class="gmail_quote">On Mon, Jan 30, 2012 at 7:24 PM, Robert V. Bolton <span dir="ltr"><<a href="mailto:robert@robertvbolton.com">robert@robertvbolton.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Over the weekend I had a weird event happen in my monitoring set. I have a host that has an Infiniband interface, and we are running the IP protocol over Infiniband, while using the check_ping plugin to verify network connectivity. This weekend our Ethernet to Infiniband gateway went down and the check_ping plugin reported that state as CRITICAL, however the it didn't increment the check attempt value, and thus a notification wasn't sent out since the max check attempts threshold was never reached. I've included some of the output of /var/log/messages that indicates the problem. Has anyone else seen this issue? As a side note I've since changed my service check to use check_icmp instead of check_ping.</div>
<div><br></div><div>Jan 28 17:12:12 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:13:12 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:14:12 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:15:12 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br><br></div><div>
Jan 28 17:42:12 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:43:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:44:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:47:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:48:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:49:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 17:50:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br><br></div><div>
Jan 28 18:31:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 18:32:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 18:33:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br><br></div><div>
Jan 28 18:42:23 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 18:43:23 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 18:44:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br>
Jan 28 18:45:22 monitor nagios: SERVICE ALERT:
<a href="http://hamrock.chpc.utah.edu" target="_blank">hamrock.chpc.utah.edu</a>;IPv4 IPoIB Ping Check;CRITICAL;HARD;1;CRITICAL
- Host Unreachable (172.21.10.170) <br><br></div><font color="#888888"><div><br></div>--<div><b><font face="arial, helvetica, sans-serif">Robert V. Bolton</font></b></div><div><font face="arial, helvetica, sans-serif">Email: <a href="mailto:robert@robertvbolton.com" target="_blank">robert@robertvbolton.com</a></font></div>
<div>Web: <a href="http://robertvbolton.com" target="_blank">http://robertvbolton.com</a></div>
<br>
</font><br>------------------------------------------------------------------------------<br>
Try before you buy = See our experts in action!<br>
The most comprehensive online learning library for Microsoft developers<br>
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,<br>
Metro Style Apps, more. Free future releases when you subscribe now!<br>
<a href="http://p.sf.net/sfu/learndevnow-dev2" target="_blank">http://p.sf.net/sfu/learndevnow-dev2</a><br>_______________________________________________<br>
Nagios-users mailing list<br>
<a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a><br>
<a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a><br>
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue.<br>
::: Messages without supporting info will risk being sent to /dev/null<br></blockquote></div><br>