Monitoring a router
David Dyer-Bennet
dd-b at dd-b.net
Wed Sep 2 23:09:57 CEST 2009
On Tue, September 1, 2009 17:41, Jim Avery wrote:
> 2009/9/1 David Dyer-Bennet <dd-b at dd-b.net>:
>> Is this "best practice" in the opinion of the community? Or is using
>> SNMP
>> to monitor something inside the router better somehow? And if so, WHAT?
>
>
> Good question. One person's 'best practice' is another person's
> over-kill or under-kill.
Ain't it the truth!
And they're probably right for their actual situation, even.
> My golden rule is "only monitor something if you're going to be
> interested in it".
This seems to be getting back to Steinbach's Guildeline for Systems
Programming: never test for an error condition you don't know how to
handle.
> For routers this usually means I simply ping them,
> but often I'm interested in bandwidth of specific interfaces too so I
> make sure specific WAN links are monitored for bandwidth, errors,
> discards and so on using the plugins from http://www.manubulon.com
Another group is responsible for that level of network maintenance. I
hope they're monitoring that sort of detail.
> It's often a good idea to have the router send you SNMP traps - you'll
> need to configure snmptt to handle them though, maybe using NagTrap.
> I often find I get more traps than I'm interested in though - which
> breaks the golden rule (see above) - so I then need either to filter
> the traps out in the snmptt config or prevent the router from sending
> them in the first place.
I probably can't get traps sent to me. But, really, I only care about
routers in terms of what parts of the topology I can and can't reach, and
ping will tell me that.
> I used to monitor each router interface using ping, but now I think
> that's usually overkill. It just depends ...
Right. Thanks.
--
David Dyer-Bennet, dd-b at dd-b.net; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
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Dragaera: http://dragaera.info
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