> tcpdump sniffs the "wire", this means incoming and outgoing packets,
> thus you are seeing loopback transmit and receive every frame.
>
> If this bothers you write some sed script to uniqify the lines output
> based upon timestamp or something like this.
Actually, I've found this useful -- I was debugging a quirky network
problem (slow TCP throughput) and the absence of some packets being
doubled up turned out to be a clue that the driver was dropping some
frames...
-cw
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