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Best way to monitor network traffic


I would like to use a deep packet inspection tool to monitor worker-instance traffic in an OpenStack-cloud, and was wondering what the best way to capture network traffic would be.

At the first look, I guess my two options are- 1. Setup a virtual switch (using OpenVSwitch or Nicara's NVP) and using it's SPAN port to get a copy of the network data. 2. Have software installed at the AMQP brokers to forward traffic (since all traffic concering worker instances passes through these brokers).

Can someone kindly validate this, or please suggest an alternate approach?

Thank you.