Host Down issue

[Forsaken]

On Fri, 20 Jun 2008 07:09:47 +1000
"Dean" <dean at xyznetworks.net> wrote:

> Hi guys, I have a fairly new install of Nagios and one particular
> host is being monitored, and until recently nothing was out of order.
> Yesterday I started getting notification "Host check timed out", but
> the box Nagios is running on cang ping and trace to the host, and all
> other service checks for that same host are running and no issues
> there. What are some of the likely causes of this and how should I
> correct this issue?

I saw a few things that were somewhat similiar to this behavior. For
me, it turned out to be the plugin timing out because it was trying to
do a dns lookup for ipv4 and ipv6, and the dns server on my LAN doesn't
support ipv6 lookups (yet). The little bit of latency was just enough
to cause it to miss some pings. I got around it by adding -4 to the
command line for the check_ping command, which tells the plugin to only
deal with ipv4.

YMMV

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