OT - fault tolerant default router for Nagios host. [SEC=UNCLASSIFIED]

[Hugo van der Kooij]

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Stanley.HOPCROFT at deewr.gov.au wrote:
|
| Dear Folks,
|
| I am writing to request comments on a proposal to reduce the risk of
| loss of Network visibility/spurious alerts etc caused by the failure of
| the Nagios host's default gateway.

Hmmm. It is my rather simple view that if monitoring is deemed vital it
should rely on redundant paths. Wether you do that with VRRP or some
routing protocol is not that important.

Then there remains the issue of how Nagios can establish if it still has
connectivity. I would create a dummy host for this and use passive
checks instead so you can pretty much write your own code to write the
status.

If you use VRRP you can simply ping thr VRRP address but if you use OSPF
for example you need to your OSPF status to see if you still have
communication abilities. Perhaps the OSPF plugin might even work for
that. But I would priopably write my own code to write a passive check
result.

I have written something similar for an SMTP loopback test. It fires a
test message tracks each step and in the end writes the last known state
as a passive check. I used sec to do the correlation required between
events for that but that is propably fully outside the scope of this
message.

Hugo.

- --
hvdkooij at vanderkooij.org               http://hugo.vanderkooij.org/
PGP/GPG? Use: http://hugo.vanderkooij.org/0x58F19981.asc

	A: Yes.
	>Q: Are you sure?
	>>A: Because it reverses the logical flow of conversation.
	>>>Q: Why is top posting frowned upon?

Bored? Click on http://spamornot.org/ and rate those images.

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