[mrtg-developers] Method of retrieving Bits per sec (MRTG ref)

Prakash Mariasusai prakashm at hcl.in
Mon Mar 29 14:00:25 CEST 2010

Hi Steve,

Thanks for your response. We tried using the below mentioned procedure.

We are getting 2 values for bits per sec,
one for Incoming packets, and the other on outgoing packets.

Is the one displayed in MRTG the sum of these 2 values?
In other words, is bytes per sec displayed in MRTG = 8 * [(ifInOctetsVal2 - ifInOctetsVal1)/(T2-T1) + (ifOutOctetsVal2 - ifOutOctetsVal1)/(T2-T1)] ?

Pls. let us know.


Re: [mrtg-developers] Method of retrieving Bits per sec (MRTG ref)

S Shipway
Wed, 17 Mar 2010 13:54:09 -0700
MRTG obtains this data by reading the ifInOctets and ifOutOctets values in the
IF-MIB via SNMP at 5min intervals, calculating the difference (taking into
account possible counter wrap)  and dividing by the time interval, then
multiplying by 8 to get bits/sec.  This is in the standard MIB.  If the
interface is a high-speed interface (>=100Mbps) and the device supports it,
then the MIB-2 isused instead and the h64bit counters ifHCInOctets and
ifHCOutOctets are used instead (to prevent counter wrap from causing problems).


From: Prakash Mariasusai [via MRTG Mailinglists]
[mailto:ml-node+4750489-553955619-68... at n2.nabble.com]
Sent: Thursday, 18 March 2010 3:13 a.m.
To: Steve Shipway
Subject: Method of retrieving Bits per sec (MRTG ref)
I am writing a small program to get the "Bits per sec" value
for a network interface in Unix systems (Solaris, Linux severs)
similar to the one provided by MRTG in the below link:
I assume that MRTG does the same through SNMP.
I am new to SNMP and if someone can point me to the appropriate MIB/OID,
for doing the same, it would be very helpful.
Thanks in advance,

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