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网络地址翻译（NAT）是防火墙的主要技术之一。传统的NAT有不能对外提供服务，协议不透明，不易扩展应用等缺点。逆向代理技术较好地解决了这些问题，能实现双向的地址映射和虚拟专用网，并运用HASH检索接收从外网到内网的逆向连接，实现与应用的兼容。
Network Address Translation (NAT) is one of the major firewall technologies. Traditional NAT can not provide services to the outside, the agreement opaque, not easy to expand applications and other shortcomings. Reverse proxy technology to better solve these problems, to achieve a two-way address mapping and virtual private network, and use HASH retrieval from the external network to the internal network reverse connection, and application compatibility.