[Jeff Morriss <jeff.morriss.ws@xxxxxxxxx>]

zhou rui wrote:
> hi all
> seems it is very confused that
> there is no "frame check sequence"field in the ethernet frame captured 
> by wireshark,while the other sniffer has that

Because most hardware (NICs) don't provide the checksum to the capturing 
engine.  Specialized (sniffer) hardware typically does since, well, it's 
whole purpose in life is capturing.