【摘要】 由于Ｉｎｔｅｒｎｅｔ的普及，在防火墙外部合法安全访问Ｉｎｔｅｒｎｅｔ内部资源也变得日益常见。本文首先回顾了穿越防火墙访问Ｉｎｔｒａｎｅｔ的常见方法，并指出了其不足，然后详细说明Ｗｅｂ隧道技术的原理及应用。更多还原

【Abstract】 Because of the popularity of intranet, it is more common that valid users access the internal resources inside firewall. The paper first summarizes the general ways that access the Intranet accross firewall, and points out their disadvantge,then detailedly explains the pricipal and application.更多还原