How to use Tor to audit networks
Tor is a software project that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security. Tor protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, and it prevents the sites you visit from learning your physical location.
It is a security tool that permits anonymous Web surfing. While it's a tool that can be used both by white hats and gray hats alike, all information security pros should be aware of how it works.
In this screencast, Peter Giannoulis of The Academy.ca details how Tor can be used by individuals to ensure their surfing habits aren't recorded by malicious hackers, and how IT professionals involved in auditing networks can mask their location so that a more thorough audit can be conducted.
Refer here to watch video by SearchSecurity.