Re: Using mrtg to monitor cable modem utilization

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Hi,

On Wed, Jun 7, 2017 at 10:11 AM, Rick Stevens <ricks@xxxxxxxxxxxxxx> wrote:

> I haven't edited the message so others can take a shot.
>
> We still use MRTG as a part of Nagios and Cacti in our monitoring
> systems but I haven't done any manual configs in a very long time. One
> common thing to keep in mind is that although NICs are generally
> specified in bits-per-second, SNMP (and consequently mrtg) use bytes-
> per-second. One gigabit IS 125,000,000 bytes (1,000,000,000 / 8 =
> 125,000,000).
>
> The MaxBytes option simply tells mrtg that values above this are to be
> ignored (ditto with AbsBytes). The primary idea is for mrtg to ignore
> nonsensical data which sometimes happens.
>
> I don't know if cfgmaker permits you to specify the "Thresh[Min|Max]*"
> options. That may still be a "manual, go hack the config yourself" step
> as it was back in the day (and a common reason people use Cacti (it
> allows you to set thresholds relatively easily through its GUI).

Thanks very much for the info. It's also been like a decade since I've
had to configure mrtg. Most of my concern comes from the large
disparity between the download (35mbit) and the upload (5mbit), and
the upload getting lost on the graph.

Ideas for other utilization graphing programs would be appreciated.
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