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oetiker / mrtg

MRTG - Multi Router Traffic Grapher
http://www.mrtg.org
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A way to ignore hosts that are unreachable #72

Open eribertomota opened 2 years ago

eribertomota commented 2 years ago

This is a bug from Debian. Thanks.

Debian Bug #97352 mrtg: a way to ignore hosts that are unreachable.

Reported by: Sami Haahtinen ressu@debian.org Date: Sun, 13 May 2001 18:48:17 UTC Severity: wishlist Found in version 2.9.10-1

it would be nice to have a feature to ignore hosts that are down, at the moment (atleast hosts that need to be walked) give out a warning and appear as void in the graphs. and as the graph is drawn from the void data it appears that the host had for example the same load while it was down. which is not true.

This might be good for hosts that aren't in the same network, but it's not a good thing for hosts that tend to be down now and then.

the right way to deal with this would be to dump 0 as the value when a host is down.

lukerg commented 2 years ago

I've wanted something like this for a while and also something to better detect device reboots (as measured by sysUpTime) when rrdtool is used (i get counter overflow handling kicking in and massive graph spikes). I lack decent perl coding skills but was starting to tinker around with adding some extra flag in the target defs to teach mrtg 'stuff zeros into the graph if this host is offline' where offline is determined by some other external probe.