[mrtg] Re: Unexpected drop-outs in graphs

[Nick Earle]

The link I am monitoring is 3Mb and I am using the following configuration file:-

     Options[router]: unknaszero, bits
     Target[router]: #Hs2/0.1:password at 123.123.123.123:
     MaxBytes[router]: 384000
     AbsMax[router]: 512000

I don't believe that the AbsMax, or MaxBytes, value can be causing this problem as I'm getting drop-outs on both the inbound and outbound graphs.

Regards,

Nick Earle


                                                                                                                     
                    "Brander Eric"                                                                                   
                    <Eric.Brander at AC       To:     mrtg at list.ee.ethz.ch                                              
                    S-INC.com>             cc:     (bcc: Nick Earle/London/GB/BAT)                                   
                                           Subject:     [mrtg] Re: Unexpected drop-outs in graphs                    
                    16/06/2003 17:20                                                                                 
                                                                                                                     
                                                                                                                     





>  The drop-out appear to occur after a specific amount of traffic has
passed, as the area
> between each drop-out appears to be the same. Please take a look at the
attached graph to
> see what I mean.

Your MaxBytes setting is too low it seems.  Try setting an AbsMax parameter
to something significantly higher or raising your MaxBytes to what is
actually the maximum for what you are monitoring.  If MRTG gets a reading
over what's specified in the MaxBytes setting, it discards it and assumes
its a 0 - unless you have the AbsMax parameter.

Eric Brander
ACS
Texas CHIP Account
Sr. Communications Engineer - Information Systems Department
512.336.3331
Eric dot Brander at acs-inc dot com

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