Traffic Analysis Tool

[Jason Morefield <jasonm_(_at_)_techie_(_dot_)_com>]

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I am writing a program that needs to know when a network interface is 
sending, receiving, or both.  Is there any tool that can be used to do 
this??  Thanks in advance.  I've google and 'man'ed and found nothing 
as well as searching the archives.
- -- 
Jason Morefield
jasonm_(_at_)_techie_(_dot_)_com
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