[mrtg] Different traffic on each side of a link

[Nicolai Strøm Gylling]

Hi

We are using MRTG/RRDTool to monitor and bill the traffic our costumers use. We are monitoring all customers in our end of the link, ex. a port in a switch.

Due to some problems we have done some monitoring in both ends of a link, and discovered that the trafficamount is not the same. In our testcases in was between an ethernet NIC in a server and a port in a switch (HP ProCurve 2524).

The trafficamount on the switchport are considerably higher than on the ethernet port in the server. 

What can cause the different readings from each end of the link? 
Will broadcast-traffic be answered by the switch, and also appear on the switch-port as traffic?
Is there a way to differentiate between the different kinds of traffic(broadcast vs. normal traffic), and thereby measure the same traffic-amount in each end of the link? 

Nicolai Gylling

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