Measuring data transfer over a NIC

From: Augustus SFX van Dusen (ASFXvD_at_story.net)
Date: 06/21/05 

Date: Tue, 21 Jun 2005 21:24:38 GMT

  I am looking for a tool that tells me how many bytes have been
transferred over a specified network interface, between two given points
in time. Anybody know about such a thing?