User Authentication at the Firewall Level

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Executive Summary

This paper focuses on how firewalls can work at the TCP/IP network layer and handle a user authentication where the IP address is not considered at all. The paper will first explain the common weaknesses of existing identity-based filtering systems, detail what exists in Net filter internals to respond to it, and propose a user friendly implementation through the NuFW project. The paper will conclude with some usage example of latest Net filter features.

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