Wireshark

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Product - Wireshark
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Home: http://www.wireshark.org/  Version: 1.0.4
Summary: Wireshark is an award-winning network protocol analyzer developed by an international team of experts.

Background

If you need to view the network traffic in out of you machine then Wireshark is the tool of choice. Previously known as Ethereal®

MacOS

If you don't see any interfaces listed when you go to Capture → Interfaces then may need to set the permissions as follows: 

sudo chmod go+r /dev/bpf*

Note that this setting won't survive a system restart

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