Net statistics

Hi,

First of all, I want to congratulate you on your excellent work with this plugin!
I have a question, I don’t understand at all how are obtained the net statistics…
If I check TxBytes in /proc/net/dev to review statistics for bond0, I watch a large number in bytes: 7342573046357

Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
bond0:1259548428146 14687025821 0 0 0 0 0 0 7342573046357 15194696711 0 0 0 0 0 0

But, If I check the Nagios web interface, this amount doesn’t match with the previous value:
/proc/net/dev = 7342573046357
Nagios Web = 5323572.80B

How the plugin estimate these values on the Nagios web interface?

Thanks in advance.