FW: Difference betwen down and unreachable

[Wheeler, JF (Jonathan)]

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-----Original Message-----
From: Wheeler, JF (Jonathan) 
Sent: 18 July 2008 15:23
To: 'Stan Brown'
Subject: RE: [Nagios-users] Difference betwen down and unreachable

> -----Original Message-----
> From: Stan Brown [mailto:stanb at panix.com] 
> Sent: 18 July 2008 15:09
> To: Wheeler, JF (Jonathan)
> Cc: Stewart Flood
> Subject: Re: [Nagios-users] Difference between down and unreachable
> 
> On Fri, Jul 18, 2008 at 01:04:53PM +0100, Wheeler, JF wrote:
> > > -----Original Message-----
> > > From: nagios-users-bounces at lists.sourceforge.net On Behalf Of stan
> > > Sent: 18 July 2008 12:26
> > > 
> > > I had a machine that was restored from an old backup tape, and did
not have
> > > it's external facing NIC configured for a few days last week.
Nagios
> > > reported it as down, rather than unreachable. How is this
determined?
> > 
> > Down means the individual system if down, that is, the host check
has
> > failed.
> > 
> > Unreachable means "not possible to test" because the parent of the
host
> > has failed (maybe a switch)
> Thanks.
> 
> I did not realize that Nagios was sophisticated to understand that a
device
> could be "dependent" upon another device. Neat, I will look into how
to
> configure this functionality

Look at the "parents" directive under the "host" definition.  Note that
you can also define service dependencies as well - see the documentation
for more details

Jonathan Wheeler
e-Science Centre
Rutherford Appleton Laboratory

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