外文翻译--当代移动世界的新型VPN
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1、附录 一、英文原文 A New Virtual Prevate Network for Todays Mobile World Karen Heyman Virtual private networks were a critical technology for turning the Internet into an important business tool. Todays VPNs establish secure connections between a remote user and a corporate or other network via the encryptio
2、n of packets sent through the Internet, rather than an expensive private network. However, they traditionally have linked only a relatively few nodes that a companys IT department controls and congures. This is not adequate for the many organizations that now must let managers, employees, partners,
3、suppliers, consultants, ecommerce customers, and others access networks from their own PCs, laptops, publicly available computers like those at airport kiosks, and even mobile devices, many not controlled by the organization. VPNs based on Internet Protocol security (IPsec) technology were not desig
4、ned for and are not well-suited for such uses. Instead of restricting remote users who should not have access to many parts of a company network, explained Graham Titterington, principal analyst with market-research firm Ovum, IPsec generally connects users into a network and gives the same sort of
5、access they would have if they were physically on the LAN. Organizations are thus increasingly adopting VPNs based on Secure Sockets Layer technology from vendors such as Aventail, Cisco Systems, F5 Networks, Juniper Networks, and Nortel Networks. SSL VPNs enable relatively easy deployment, added Ch
6、ris Silva, an analyst at Forrester Research, a market-researchrm. A company can install the VPN at its head quarters and push any necessary software to users, who then access the network via their browsers, he explained. Organizations thus do not have to manage, update, or buy licenses for multiple
7、clients, yielding lower costs, less maintenance and support, and greater simplicity than IPsec VPNs,Silva said. From a remote-access perspective, IPsec is turning into a legacy technology, said Rich Campagna, Juniper SSL VPN product manager Nonetheless, IPsec VPNs are still preferable for some uses,
8、 such as linking a remote, company-controlled node, perhaps in a branch ofce, with the corporate network. Both VPN flavors are likely to continue to ourish, with the choice Published by the IEEE Computer Society An early attempt to create a VPN over the Internet used multiprotocol label switching, w
9、hich adds labels to packets to designate their network path. In essence, all packets in a data set travel through designated tunnels to their destinations. However, MPLS VPNs dont encrypt data. IPsec and SSL VPNs, on the other hand, use encrypted packets with cryptographic keys exchanged between sen
10、der and receiver over the public Internet. Once encrypted, the data can take any route over the Internet to reach its nal destination. There is no dedicated pathway. US Defense Department contractors began using this technique as far back as the late 1980s, according to Paul Hoffman, director of the
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