[mrtg] some help!

["Rafael M. Carballosa Hernández"]

We have been working on information generated by mrtg, taking results of 
pooling process  (log al old archives) and graphics generated by mrtg, 
just information about bandwidth consumption.
Mainly, we use those datas to introduce them into postgres database and 
letexternal users to perform different types of queries through a website.
We are having problems with the calculation of bandwidth. On several 
occasions the percentage of occupation is going above 100%. I know that 
this is impossible, I have verified with the service provider and 
bandwidth is correct, I make calculations speed as logic says (calculate 
the difference of bytes in the number of seconds elapsed and express 
them in bits/sec). I am writing to you to know if you have had this 
experience and help me find the solution.
An example: An user connected with adsl,  download bandwidth of 6400 
Kbps, register speed of 6500, 6800 Kbps in high traffic peaks.

Thanks in advance,
Rafael
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