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Wireshark. Run it on a separate machine to be sure you see everything.

Just a heads up: you won't see the contents of any encrypted traffic with Wireshark without some setup (i.e. MITM your traffic + install a root cert for said MITM). http://stackoverflow.com/questions/1073166/capturing-https-t...

But what about the ever growing number of TLS connections?

You can still see the source and destination though of course.