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In school our professor demonstrated how the software Ethereal could be used to eavesdrop VoIP calls. That software no longer seems to exist since the webpages are no longer around.

What other software I should know about that could be used by employees on my internal network to eavesdrop VoIP calls?

How big of a concern should I make this?

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closed as not constructive by AviD Dec 5 '12 at 7:27

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

Hi Gabriel, this question is calling for product recommendations, or a list of products. This type of question is not really a good fit for SE sites - please see the FAQ. But btw, as one answer noted, Ethereal -> Wireshark. – AviD Dec 5 '12 at 7:29

Ethereal was renamed Wireshark back in 2006 due to trademark issues.

Ethereal/Wireshark is just a packet capture tool with a GUI front end, there are many packet capture tools available. As to intercepting particular traffic, that would depend on particular network architecture and/or various attack methods that end up being a man in the middle.

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Vomit was an old one I think Cain and Able has this functionality as well.

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