MRTG - The Multi Router Traffic GrapherWhat it does You have a router, you want to know what it does all day long? Then MRTG is for you. It will monitor SNMP network devices and draw pretty pictures showing how much traffic has passed through each interface. Routers are only the beginning. MRTG is being used to graph all sorts of network devices as well as everything else from weather data to vending machines. MRTG is written in perl a
https://www.ietf.org/rfc/rfc1157.txt
