Differentiate between monitoring modem Vs router

[Mick]

On Sunday 30 September 2007, Mick wrote:
> Hi All,
>
> I want to monitor a host who has a Linksys router, which after 24 hours or
> so from being power cycled gradually locks out.  All attempts to ping,
> httping, traceroute, fail.  Surprisingly, nmap shows:
> =====================================
> Host XX-XXX-XXX-XX.dhcp.kgpt.tn.charter.com (XX.XXX.XXX.XX) appears to be
> up ... good.
> =====================================
>
> Sometimes it may find an open port, sometimes not in which case it reports
> that all ports are filtered.  I assume from these tests that the problem
> lies with the router as opposed to the modem, otherwise I would get a
> connection refused/failed sort of message, right?  Is there a way to set up
> Nagios to monitor/compare both modem and router?  I am thinking along the
> lines of pinging the router as normal and when that fails repeatedly, to
> run a command to check the modem.  How should I go about setting this up?

Any ideas at all guys?  I'm really stuck here.
-- 
Regards,
Mick
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