Chapter 9. Firewall Traversal

In Chapter 7, we demonstrated the use of the Advertising service to link several engines together. Typically, service engines of different entities (or companies) will be protected and separated by firewalls. Firewalls protect local area networks from malicious intrusions and access to internal assets. Internet firewalls allow network administrators to define a centralized gate that tries to keep unauthorized users, such as hackers, crackers, vandals, and spies, out of a protected network; it ...

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