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本文在阐述各种防火墙技术的原理、优势及缺陷的基础上，对各种技术进行了综合比较，并、对决定防火墙性能的主要因素进行了深入地探讨。最后文章引出了防火墙技术的不足及发展方向。
On the basis of expounding the principle, advantages and disadvantages of various firewall technologies, this paper makes a comprehensive comparison of various technologies and probes into the major factors that determine the performance of the firewall. The last article leads to the lack of firewall technology and development direction.