[mrtg] Re: MRTG/spikes after router reboot with fix/patch for 2.9.29

[Arun Kumar]

Dear  Jeremy,

I got your message at the right time. I was too looking for a workaround for
the strange spikes. The problem I face is not due to Router reloads, but
whenever my MRTG server loses connectivity with the routers, it displays
spikes.  Hope your patch works based upon router uptime. Will it work for my
case?

Waiting for a reply,

Thanks,
Arun Kumar.
----- Original Message -----
From: "Michael Markstaller" <mm at elabnet.de>
To: "Jeremy Chadwick" <freebsd at jdc.parodius.com>; <mrtg at list.ee.ethz.ch>
Sent: Monday, April 19, 2004 1:53 PM
Subject: [mrtg] Re: MRTG/spikes after router reboot with fix/patch for
2.9.29


Jeremy,

I'm also replying to the list in case there're some others interested..
Unfortunately I never received any feedback, besides few "thanks"-mails from
some users also fed up with spikes.
I've made me a local DEB with my patched 2.9.29 running happy with it,
without ever seeing spikes again.
As the rest of the MRTG-world doesn't seem to care about these spikes, I
haven't created any patch for newer 2.10 versions. Although I'm curious why
other users don't get mad with these spikes..

What I already wrote: The problem is, that MRTG/RRDTool simply "guesses" a
counter-wrap occured when an snmp-agent is rebooted between two polls. Seems
simple to me looking on the uptime, because if at least one poll fails
(agent unreachable) you also won't get spikes and that is what my patch
enforces, I even made it configurable and not-default in case anybody is
missing the spikes in their graphs ;)
The intention in creating a configurable option for this patch was indeed to
have it included in the official mrtg. All other "workarounds" discussed the
last years with maxbytes etc. are reducing the problem somehow but do not
eliminate it.
All the details should've been in my inital post:
http://www.ee.ethz.ch/~slist/mrtg/msg25867.html

Anyway, if there's some interest I'll look into 2.10 and create a new patch
the next days. If there isn't changed too much it should be quite simple to
adjust for 2.10.13

Michael

-----Original Message-----
From: Jeremy Chadwick [mailto:freebsd at jdc.parodius.com]
Sent: Sunday, April 18, 2004 9:08 PM
To: Michael Markstaller
Subject: Re: MRTG/spikes after router reboot with fix/patch for 2.9.29


Michael,

I was curious -- did your patch ever get officially committed?

This issue (re: spikes) has continued to haunt all administrators
across the world since as early as 1999.
...

If your patch didn't get committed: we're now up to mrtg 2.10.13, and
still no fix for this problem.  This angers me immensely.

Let me know if you have a patch for 2.10.13, as I'd love to submit it
to the FreeBSD ports tree so that people could at least solve this
problem in that branch.

Thanks!

--
| Jeremy Chadwick                                 jdc at parodius.com |
| Parodius Networking                        http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, USA |
| Making life hard for others since 1977.                             |

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