虚拟专用网络 VPN(Virtual PrivateNetwork)可以利用 Internet 或其它公共互联网络的基础设施,实现不同网络的组件和资源之间的相互连接。虚拟专用网络对用户端透明,用户好象使用一条专用线路在客户计算机和企业服务器之间建立点对点连接,进行数据的传输。企业开设 VPN 服务所需的设备很少,只需在用户(企业)网络处放置一台VPN 的服务器即可。需要访问企业内部网络的用户通过拨号连入本地 ISP(In-ternet 服务提供商)的接入服务器后,直接呼叫企业的 VPN 服务器,剩下的工作就完全由 ISP 的接入服务器来完成。马钢在新项目热轧薄板的二级调试中就使用了这项技术,利用马钢现有的 VPN 服务器和网络,允许负责项目调试的外方公司人员从欧洲总部远程登录马钢热轧板厂的二级内部网络,帮助现场调试人员解决调试中出现的问题。与发邮件和打电话解决问题相比,在欧洲总部的工作人员虽远在千里之外,由于能登录到马钢热板厂的二级本地服务器,就象亲临现场一样,许多问题一目了然;双方联系不用受时差的限 Virtual Private Network VPN (Virtual Private Network) can take advantage of the Internet or other public Internet infrastructure to achieve the interconnection of components and resources of different networks. The virtual private network is transparent to the client and the user appears to use a dedicated line to establish a point-to-point connection between the client computer and the enterprise server for data transfer. Enterprises to set up VPN services require very little equipment, just in the user (business) network to place a VPN server can be. After accessing the access server of the local ISP (In-ternet service provider) through dial-up, users who need to access the internal network of the enterprise directly call the enterprise VPN server, and the rest of the work is completely performed by the access server of the ISP. Masteel used this technology in the second commissioning of its new hot-rolled sheet, utilizing Masteel’s existing VPN server and network to allow foreign company personnel in charge of project commissioning to remotely log Masteel’s hot-rolled sheet from its European headquarters Second-class internal network plant to help on-site debugging staff to solve problems in debugging. Compared with sending mail and making phone calls to solve problems, the staff in the headquarters in Europe are far away from home. As they can log in to the second-tier local server of the Masteel hot-plate factory, just as they are on the scene, many problems are clear at a glance. Do not be limited by the time difference