Blocked router in host list

[Carroll, Jim P [Contractor]]

In a strict environment, even ICMP and UDP can be blocked.  So much for ping
and traceroute.

Argh... I wish there were a better way.  A 'virtual parent' or some such,
and a threshold, eg, "when 4 or more hosts from this hostgroup fail, check
the others, and if all the others have failed, send a single alert on the
virtual parent".  :P

jc

> -----Original Message-----
> From: Marc Powell [mailto:mpowell at ena.com]
> Sent: Thursday, September 19, 2002 10:02 AM
> To: nagios-users at lists.sourceforge.net
> Subject: RE: [Nagios-users] Blocked router in host list
> 
> 
> Just my $0.02, but it's generally not a good idea to be telneting to
> routers you don't own or maintain ;)
> 
> What you really need is a check_icmp probe that uses TTL. I'm 
> not aware
> of any that exist right now. I suppose you could write a wrapper to
> traceroute itself. Pass the wrapper the host name or IP you want to
> trace to and what to look for (probably the same has the host name or
> IP), issue the traceroute command and watch the output. If you see the
> hostname/IP you're looking for, then everything's great. If not then
> something's wrong. This could potentially be a highly latent kind of
> check though, especially if the host _is_ down and you have 
> to wait for
> traceroute to time out. The -m switch might be useful.
> 
> --
> Marc
> 
> > -----Original Message-----
> > From: Carroll, Jim P [Contractor] 
> [mailto:jcarro10 at sprintspectrum.com]
> > Sent: Thursday, September 19, 2002 9:49 AM
> > To: nagios-users at lists.sourceforge.net
> > Subject: RE: [Nagios-users] Blocked router in host list
> > 
> > This might sound silly, but you could use the usual ICMP host check,
> but
> > also do an ICMP service check.
> > 
> > Are there no ports open on the router itself?  Not even telnet?
> > 
> > jc
> > 
> > > -----Original Message-----
> > > From: Bas Rijniersce [mailto:bas at brijn.nu]
> > > Sent: Tuesday, September 17, 2002 11:06 AM
> > > To: Marc Powell
> > > Cc: nagios-users at lists.sourceforge.net
> > > Subject: Re: [Nagios-users] Blocked router in host list
> > >
> > >
> > > Hi,
> > >
> > > >It will always stay undetermined until a service check is
> > > completed. I'm
> > > >confused why you would want to add a device to Nagios that you
> can't
> > >
> > > Yup, you might be right. But I wanted to stay as close as
> > > possible to the
> > > traceroutes with the host mapping. If isn't draw in the 
> picture it's
> a
> > > little harder to follow if this router really dies (and all
> > > the hosts behind
> > > it go down).
> > >
> > > What is strange, in a traceroute it is turning up as a host. Is
> there
> > > somesort of check that could use this behaviour??
> > >
> > > Thanx,
> > > Bas
> > >
> > >
> > >
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