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Why i am seeing difference in bandwidth usage of MRTG for same period calculated on different dates

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1. Bandwidth usage is calculated on 1st of every month for the previous month.
2. The calculation is based on the actual log entries in the MRTG logs.
3. The MRTG log file consists of traffic samples of various intervals as explained in: http://oss.oetiker.ch/mrtg/doc/mrtg-logfile.en.html
4. The frequency of samples of older traffic is reduced by MRTG to keep the logfile size consistent and manageable.
5. Hence, when attempting to calculate traffic usage for an older period, the chances of inaccuracy increase, since the frequency of samples is lower.

This is the precise reason that traffic is calculated on the 1st day of each month for the previous month.


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