You can create a firewall rule to explicitly allow traffic on the same ports that you created shaping rules for and set those firewall rules to be logged. Make sure these rules lie above your default allow rule if that is what is passing these packets at present. Then check your firewall log for matches.
You can also follow these instructions to create a page that shows cumulative traffic counts based on fw rules:
http://wiki.m0n0.ch/wikka.php?wakka=HostTrackingYou can stop at the MRTG section, just check dump.php for your totals.
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