[mrtg] Strange MRTG problem

[Simon Westlake]

Thanks for the ideas. Community string is actually redacted, but I guess I
should've made that more obvious than mashing the keyboard :)

Agreed, my first thought was v1 but I am now specifically targetting 64bit
counter OIDs and I've verified it is using SNMP v2 through debug options.
Definitely sure the port is the same - low values are slightly different
but the intervals are also slightly different (Cacti is running on 1
minute, MRTG is running on 10 minutes.)

The MRTG version is super old - that was one of my first thoughts, I'm just
somewhat reluctant to even touch it as it's running on an incredibly old
version of Linux as well but I think that is my next plan.

Not using a third party front end, it is a custom PHP script that calls
'rrdtool graph' directly. I will try rearranging the config file, thanks
for that idea.


On Tue, May 14, 2013 at 10:34 PM, Steve Shipway <s.shipway at auckland.ac.nz>wrote:

> A few thoughts****
>
> ** **
>
> **1.       **You’ve just told the world your SNMP community string.  Oops.
> ****
>
> **2.       **It certainly looks a bit like an SNMPv1 issue, though that
> would generally top off about 120Mbps.  However the config seems to use v2
> correctly.****
>
> **3.       **Are you absolutely certain that both graphs relate to the
> same port?  Possibly there is some confusion in the settings?****
>
> **4.       **Look at the two graphs close up.  Are they exactly the same
> for low values, then lose it for high values?  If so, maybe its using
> SNMPv1 anyway.  If not, maybe you’re graphing something different.****
>
> **5.       **Which version of MRTG do you have?  Possibly an old one is
> not handling things correctly.  Get a copy of 2.17.x installed and see if
> the problem goes away.****
>
> **6.       **There’s always the possibility that Cacti is getting it
> wrong, so check there as well.****
>
> **7.       **Is it a bits/bytes issue?  If Cacti is showing 8x the MRTG
> value, maybe MRTG is showing in bytes. Though you have ‘options bits’.****
>
> **8.       **What frontend are you using for MRTG/RRD?  Some, notably
> Routers2.cgi in earlier versions, want the Target line to come first in the
> stanza.  Try rearranging them this way, maybe the Options line is getting
> ignored and you’re viewing in bytes/sec.****
>
> ** **
>
> HTH****
>
> ** **
>
> 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)9 923 6487*
>
> *Mobile: +64 (0)21 753 189*
>
> *Email: s.shipway at auckland.ac.nz*
>
> P Please consider the environment before printing this e-mail : 打印本
> 邮件，将减少一棵树存活的机会****
>
> ** **
>
> *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 *Simon
> Westlake
> *Sent:* Wednesday, 15 May 2013 2:26 p.m.
> *To:* mrtg at lists.oetiker.ch
> *Subject:* [mrtg] Strange MRTG problem****
>
> ** **
>
> Hello,****
>
> ** **
>
> It's been a long time since I used MRTG (I've been writing directly to
> rrds for a long time now) but an old employer of mine asked me to
> troubleshoot a legacy MRTG setup and I'm having a strange problem with it I
> cannot decipher.****
>
> ** **
>
> I am graphing a port in two ways. One is in Cacti, one is with MRTG. Both
> are using 64bit counters (I have even setup the MRTG configuration to
> specifically use the HC OIDs rather than assuming they are being queried by
> specifying :::::2)****
>
> ** **
>
> In Cacti, I get the correct value (approximately 700-800Mbps per second.)
> In MRTG, it is never more than 190-200Mbps.****
>
> ** **
>
> My MRTG configuration looks like this:****
>
> ** **
>
> WorkDir:/var/www/mrtg****
>
> Forks: 30****
>
> Refresh: 300****
>
> Interval: 5****
>
> MaxAge: 999999999999999999999999****
>
> SnmpOptions: retries => 1, timeout => 1****
>
> LogFormat: rrdtool****
>
> ** **
>
> ** **
>
> Options[DAS-c3229-bandwidth]: growright,bits,nolegend,nobanner,nopercent**
> **
>
> Directory[DAS-c3229-bandwidth]: DAS-c3229****
>
> Target[DAS-c3229-bandwidth]:
> 1.3.6.1.2.1.31.1.1.1.10.140&1.3.6.1.2.1.31.1.1.1.6.140:8GF8961u at 24.160.238.254:
> ::::2****
>
> Extension[DAS-c3229-bandwidth]: php****
>
> Suppress[DAS-c3229-bandwidth]: y****
>
> Title[DAS-c3229-bandwidth]: Bandwidth Utilization****
>
> Maxbytes[DAS-c3229-bandwidth]: 200000000000000000****
>
> AbsMax[DAS-c3229-bandwidth]: 200000000000000000****
>
> ** **
>
> I have tried tweaking a lot of things and I can't seem to figure out
> what's going on. Any insight would be appreciated as I'm 2+ days into
> troubleshooting this thing and it's driving me crazy. Thanks!****
>
> --
> - Simon Westlake****
>



-- 
- Simon Westlake
[ digitalgunfire.com ]
AIM: ShirowDG
ICQ: 2227213
Voice: (414) 810-6392
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