NAT can prevent exterior peopbe from accessing LAN's interior resource, but also fetch much restriction on communication between LANs. The media stream programs which have been deployed have no ability of penetrating NAT,so they cann't communicate correctly. Only modifing these programs will raise some difficulties, for example: time consuming, cost rising and security reducing. This paper give a prototype agent which utilizes port mapping to achieve proxy channels. Agent can manage these proxy channels by dynamic allocating, releasing and secure certificating. With excellent expansibility, Agent can been integrated into other program. It has high practical value.%设置NAT能有效防止外部用户访问局域网内部资源,但却给同机构不同地域局域网间访问带来很多限制,已布署的实时流媒体软件因不具备NAT穿透功能,从而导致传输受阻,单方面地去改造这些流媒体软件,将会引发诸如:时间、成本、安全性等一系列问题.本文提供的agent原型,利用端口映射机制,代理穿透通道并对它们进行动态分配、释放及安全认证,从而打破NAT屏障.Agent同时提供很好的可扩展性,可方便集成到其它传输系统之中,具有极高的使用价值.
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