a bug in graph based on rrd data - part 1

rrd means round robin data. it is useful when log statuses of some machines. i.e. cpu load, network traffic. usually  rrd tools get data from a 32bit counter that starts from 0 and reset when over its limit.

there is a critical problem in this way. if you’re in the way like 2432823232 and probably next data will be like this 2432825895, but if the machine is reset, counter starts 0 again. in normal case, network traffic is 3000~4000 bps and soon it jumps 2^32 - 2432823232 bps or else..

how can i avoid this problem.. i have to guess from now..