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My ISP is known for having frequent downtimes. I use a ubuntu 10.04 based server as a primary gateway for my NAT network. I am looking for a tool or script that will measure the duration of each down time.

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Hopefully you'll be giving this information to your ISP and complaining. I've had my fair share of expensive under-par ISP service. – MaxMackie Sep 25 '11 at 19:33

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Some ideas:

  1. You could use the ping plug-in for collectd to monitor ping time from your ubuntu gateway to some selected internet hosts.
  2. If your router supports SNMP, You could use mrtg to monitor traffic on the router interfaces.
  3. You could install smtpd on your ubuntu gateway and use mrtg to monitor the gateway interfaces.
  4. Last, but not least, you could use snmp collectd plug-in to monitor directly the uptime on your router wan interface (but this requires some basic snmp knowledge).
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