Next month we ll examine an implementation of peer discovery that uses ip multicast to locate active peers 下个月，我们将研究使用ip多播来查找活动对等点的对等点发现的实现。
We ll begin with a simple example that demonstrates how two processes communicate using ip multicast 我们将从一个简单的示例开始，该示例演示了两个进程如何使用ip多播进行通信。
Discovery using ip multicast technology works by having peers periodically announce their existence using multicast 使用ip多播技术的发现通过让对等点用多播定期宣布自己的存在来工作。
Ip multicast address is used to identify a group . group member is identified by ( ip address , member id ) tuple 文中采用ip多播地址来标识组，组内成员的标识采用( ip地址，成员id )二元组的形式。
At present , the problem on reliable multicast transmission is being investigated yet , and do n ' t come into being a uniform standard 目前关于ip多播的可靠传输问题还在研究之中，并没有形成标准。
While the example above is a fine demonstration of ip multicast , it falls short of what s required to implement ip multicast - based peer discovery 尽管上述示例是一个很好的ip多播的演示，但它没有说明实现基于ip多播的对等点发现需要什么。
Then we detail the implementation of telephone and ip multicast conference , directory control and message entities integration . at last , a conclusion is made Net和webservice的开发方案，并且详细描述了电话和ip多播会议、目录控制、消息实体间的集成等模块的实现细节。
Supports ip telephony applications ; publishes ip multicast conferences on a network , and can also publish user ip address mappings for h . 323 ip telephony ( a standard for multimedia communications ) 支持ip电话应用程序；在网络上发布ip多播会议，也可发布h . 323ip电话（多媒体通讯的标准）的用户ip地址映射。
However , ip multicast make use of udp protocol to deliver datagram on the transport layer , which only provides a " best effort delivery " service , so this protocol ca n ' t sure the reliability of data transmission 然而ip多播使用的传输层协议是udp协议，提供的数据传输只是“尽力交付” ，不能保证数据传输的可靠性。
But the data transmission of cooperative design demands the perfect reliabil ity , so some necessary error control methods used in application are indispensable to realize the reliability of data transmission 而在协同设计中的数据交互要求能够保证数据传输的完全可靠，因此必须在应用程序中进行必要的控制方法来实现ip多播的可靠传输。
