Blocked router in host list

[Marc Powell]

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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> 
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