The Multi Router Traffic Grapher (MRTG) is a free software to monitor and measure the traffic load on network links.This provide us the graphical representation of network traffic. MRTG gives only an average value of transfer. From this value we can calculate the exact monthly bandwidth using the following equation:
Total months bandwidth = ( Monthly Average incoming + Monthly average outgoing data ) /8 x 60 sec x 60 min x 24 hrs x 30.5 days
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