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What Do Firewalls Protect?An Empirical Study of Firewalls, Vulnerabilities, and Attacks


Firewalls are a cornerstone of how sites implement "defense in depth." Many security policies assume that outside attackers must first penetrate a firewall configured to block their access. This paper examines what firewalls protect against, and whether those protections are sufficient to warrant placing the current level of trust in firewalls.

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