network packet origin ( ? OT ? 8.2 )

Hi, Since instaled 8.2 ( replace 8.0 ) my network monitor suggests that something is delivering little bursts of about 20k to my machine from somewhere on the network. How can I tell is this is an issue withthe way that 8.2 detected the internal eth0 on this laptop or if they are from another host how do I go about finding which one? TIA Francesco