How to check Internet access and/or DNS?

[Marc Haber]

Hi,

some services, most notably DNS, depend on the Internet to be
available. I'd like to express this in Nagios configuration. I'd
probably need to have a service "Internet" for that where my DNS
service definitions could depend on to avoid DNS being reported down
in case of an internet outage.

Any idea how to do this elegantly? I don't find the idea of pinging my
ISP's router at the national Internet Exchange Point very appealing.

On a second thought, how do I check DNS? I mean, even with the
Internet down, my local DNS servers probably can correctly serve DNS
records for my local network which they're authoritative for. So, does
it make sense to check the DNS servers once for an external host (like
www.nagios.org) and once for an internal host, resulting in two
services being checked on the DNS server?

What do you do regarding DNS server checks?

Greetings
Marc

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Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Mannheim, Germany  |  lose things."    Winona Ryder | Fon: *49 621 72739834
Nordisch by Nature |  How to make an American Quilt | Fax: *49 621 72739835


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