Hi Sebastian,
a couple of things come to my mind - let me know if you have any joy with them:
- Ethereal could be counting packet sizes differently compared to pmacct. pmacct
  counts IPv4/6 header's length plus the payload. ie.m L2 and ethernet-related
  stuff are excluded. If this is the case, number of packets should be roughly
  the same. 
- Is any of plugin_buffer_size or plugin_pipe_size enabled? If that's the case
  then pmacct buffers could be affecting your totals (ie. at any time a certain
  quantity of packets are still held in the buffer). To adjust this, you should
  gracefully terminate pmacct, ie. "killall -INT pmacctd". 

Also, don't forget to compare what Ethereal and pmacct say with any third-party
software. As a last resort, if none of the above is successfull, can you send me
a reasonable captured file together with the counters (packets and bytes) from
both Ethereal and pmacct? I'll investigate the problem, also comparing them with
different platforms (as i don't have access to any FreeBSD 6.x).


Cheers,
Paolo

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