David, 

I currently do run a modified command for tcpdump when Im generating traffic 
from the spirent. 

tcpdump -i eth2.10 -nn | cut -c 1-8 | uniq -c

as I think it works, it grabs all the packets per second and writes out the 
amount that its receives. 

although for example when I run this command I do see this when I stop it. 

186349833 packets received by filter
112972610 packets dropped by kernel

Robert
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