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

[Martin Wheldon]

On 2/23/08, Hugo van der Kooij <hvdkooij at vanderkooij.org> wrote:
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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/
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Hi,

It is my opinion that you shouldn't dismiss

Link teaming/bonding

I implemented it at my last work place in active/passive mode 18
months ago and it worked a charm. Saved our bacon when we lost a core
switch and would failover completly reliable in all our tests.

Martin

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