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讨论在ＶｏＤ系统中Ｉｎｔｅｒｎｅｔ代理服务器方案与设计，提出在ＶｏＤ中采用的Ｉｎｔｅｒｎｅｔ网络层代理服务方式，网络层代理具有支持Ｉｎｔｅｒｎｅｔ未知与将来出现服务的优点，并且对用户透明，安全性高．给出了ＩＰ变换源端口代理的原理，采用了环形列表法来实现正、反代理变换，并探讨了代理服务器实现流量统计与包过滤防火墙的功能．已设计出多种代理服务．
Discusses the scheme and design of Internet proxy server in VoD system and proposes the Internet network layer proxy service mode used in VoD. The network layer proxy has the advantages of supporting Internet unknown and future services, and is transparent to users and highly secure. The principle of IP source port proxy is given. Ring list method is adopted to realize forward and reverse proxy transforms, and the function of proxy server to implement traffic statistics and packet filtering firewall is also discussed. A variety of agency services have been designed.