Is user question allowed here?

[ishare <june.tune.sea () gmail com>]

  is  question about  use of tcpdump allowed in this list?
  
  I am running linux in vmware and  use tcpdump to capture all tcp packets 
  send/receive by its virtual net card,the server and client are running at the same host .

  But ,after client send/receive several packets to/from server ,only to find 0 
  packet have been captured by tcpdump. 
  
  My command is : tcpdump tcp

  what is the possible reason ? 

  Thanks!
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