mrtg (multi-router traffic grapher) users

Glenn Smith | 17 Apr 2012 17:25

MRTG and Cable Modems

All,

We have an Arris CMTS C3 device and we monitor the bandwidth usage via MRTG. At some point MRTG was also setup to monitor each modem status (Online/Offline) and it provided this information on an Intranet website. Currently the website does not have any information, it just stopped working. We looked at the modem binary files but SNMP is not configured there to provide this information to MRTG. Where else would I look and how do I configure MRTG/CMTS router to monitor cable modem status? We currently running MRTG on CentOS. Any direction would be greatly appreciated.

Thanks,

Glenn

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Steve Shipway | 17 Apr 2012 23:50

Re: MRTG and Cable Modems

If this worked in the past, then check your MRTG .cfg files and see how it was configured to do it previously. Then identify what has changed to prevent this from working.

It is possible that you simply need to re-enable SNMP on your modems.

Steve

Steve Shipway

ITS Unix Services Design Lead

University of Auckland, New Zealand

Floor 1, 58 Symonds Street, Auckland

Phone: +64 (0)9 3737599 ext 86487

DDI: +64 (0)9 924 6487

Mobile: +64 (0)21 753 189

Email: s.shipway <at> auckland.ac.nz

P Please consider the environment before printing this e-mail

From: mrtg-bounces+s.shipway=auckland.ac.nz <at> lists.oetiker.ch [mailto:mrtg-bounces+s.shipway=auckland.ac.nz <at> lists.oetiker.ch] On Behalf Of Glenn Smith
Sent: Wednesday, 18 April 2012 3:26 a.m.
To: mrtg <at> lists.oetiker.ch
Subject: [mrtg] MRTG and Cable Modems

All,

Thanks,

Glenn

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Glenn Smith | 18 Apr 2012 00:30

Re: MRTG and Cable Modems

There's a directory called home/MRTG/modemstatus and I don't see a MRTG config file. But there was a cfg file in another directory which I believe is monitor only the ports on the CMTS device. So at this point, for the modems, I'll need to set this up from scratch. How to do this is my question, if the modems were not configured for SNMP and the bin files being handed out do not have any SNMP settings configured???? How then did MRTG monitor these modems before?

Thanks,

Glenn

On Apr 17, 2012, at 5:50 PM, "Steve Shipway" <s.shipway <at> auckland.ac.nz> wrote:

If this worked in the past, then check your MRTG .cfg files and see how it was configured to do it previously. Then identify what has changed to prevent this from working.

It is possible that you simply need to re-enable SNMP on your modems.

Steve

Steve Shipway

ITS Unix Services Design Lead

University of Auckland, New Zealand

Floor 1, 58 Symonds Street, Auckland

Phone: +64 (0)9 3737599 ext 86487

DDI: +64 (0)9 924 6487

Mobile: +64 (0)21 753 189

Email: s.shipway <at> auckland.ac.nz

P Please consider the environment before printing this e-mail

From: mrtg-bounces+s.shipway=auckland.ac.nz <at> lists.oetiker.ch [mailto:mrtg-bounces+s.shipway=auckland.ac.nz <at> lists.oetiker.ch] On Behalf Of Glenn Smith
Sent: Wednesday, 18 April 2012 3:26 a.m.
To: mrtg <at> lists.oetiker.ch
Subject: [mrtg] MRTG and Cable Modems

All,

We have an Arris CMTS C3 device and we monitor the bandwidth usage via MRTG. At some point MRTG was also setup to monitor each modem status (Online/Offline) and it provided this information on an Intranet website. Currently the website does not have any information, it just stopped working. We looked at the modem binary files but SNMP is not configured there to provide this information to MRTG. Where else would I look and how do I configure MRTG/CMTS router to monitor cable modem status? We currently running MRTG on CentOS. Any direction would be greatly appreciated.

Thanks,

Glenn

_______________________________________________
mrtg mailing list
mrtg <at> lists.oetiker.ch
https://lists.oetiker.ch/cgi-bin/listinfo/mrtg

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Steve Shipway | 18 Apr 2012 00:34

Re: MRTG and Cable Modems

>There's a directory called home/MRTG/modemstatus and I don't see a MRTG config file. But there

>was a cfg file in another directory which I believe is monitor only the ports on the CMTS device. So

>at this point, for the modems, I'll need to set this up from scratch. How to do this is my question, if

>the modems were not configured for SNMP and the bin files being handed out do not have any SNMP

>settings configured???? How then did MRTG monitor these modems before?

I have no way to tell how you were doing it before without being able to see the original cfg files, which you cannot find.

MRTG can collect its data from SNMP or from an external plugin. Since you say SNMP is and always has been disabled on these devices, I assue whoever set it wrote a custom data collection plugin script to do the data collection, using some other method I am not aware of.

You can check the documentation on the MRTG website on how to create a custom plugin.

You will need to find out for yourself how to query the status of these devices remotely without using SNMP.

Steve

Steve Shipway

ITS Unix Services Design Lead

University of Auckland, New Zealand

Floor 1, 58 Symonds Street, Auckland

Phone: +64 (0)9 3737599 ext 86487

DDI: +64 (0)9 924 6487

Mobile: +64 (0)21 753 189

Email: s.shipway <at> auckland.ac.nz

P Please consider the environment before printing this e-mail

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