How to check Internet access and/or DNS?

[Steve Shipway]

So many different ways to do this.  We do it thusly.

1) Set up a host for your border router.
2) Within this, sefine a number of http check services that try to collect
web pages from popular internet sites ( google, microsoft, ibm...).  Disable
notifications on them.
3) Use check_summary (from nagiosexchange.org) to define a service which is
OK if any of the http check services are OK, and critical if they are all
down.

Now, the check_summary service will go critical if and only if *all* the
http checks are failing, which would indicate a loss of Internet
connectivity somewhere beyond your border router.  You can even add a final
check to ping a known IP address on the internet to this in case your
external DNS fails.

Steve




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