注意，一些多播地址可能是保留的。
端口，在其中多播数据将被接收。
客户端可通过如下方式加入多播组。
The client can join the multicast group in the following way.
groupName：多播组数目。
NIC地址，在其中多播数据将被接收。
The address of the NIC on which the multicast data will be received.
清单9演示如何预订多播消息或取消预订。
Listing 9 shows how to subscribe to or unsubscribe from multicast messages.
异步数据报通道与多播。
多播地址对一个隧道服务器无效。
清单10演示主机如何使用多播数据报接收和发送消息。
Listing 10 shows how a host USES multicast datagrams to receive and send messages.
那么，现在有两种获取视频的主流方式——单播和多播。
So, there are two broad approaches to get video to you-unicasting and multicasting.
现在，打开数据报通道并设置多播选项，如清单4所示。
Now, we open the datagram channel and set up the options for multicasting, as shown in Listing 4.
在多播委托的内部，每个对象会被连续的调用。
Inside a multicast delegate invocation, each target is called in succession.
希望加入这个多播组的对等计算机必须显式地预订这个组。
Peer computers interested in being a part of this multicast group must explicitly subscribe to the group.
可以支持多播委托。
作为一种一对一协议，SSL不能很好地支持多播应用程序。
Being a one-to-one protocol, SSL does not support multicast applications very well.
有了多播，每个客户机能拾取单一数据流而节省带宽。
With multicast, a single stream can be picked up by each client, saving bandwidth.
参考MulticastAddresses获取多播组地址分配。
Refer to multicast Addresses for multicast group address assignment.
客户可以在LANE服务器上注册目的MAC地址单播和多播。
Clients can register destination unicast and multicast MAC addresses with the LANE server.
然而，当服务端也不支持多播时我们只能使用以前的老方法了。
If, however, the server itself does not support multicasting then we must use the old method.
dataPort：用于结合多播组地址的目标端口，默认是34343。
DataPort: the destination port that is used in combination with the multicast group address; this defaults to 34343.
已经预订某一多播组的对等计算机会收到任何成员发送给这个组的所有消息。
Peer computers that have subscribed to a multicast group receive all messages that any of the component peers sends to the group.
对等点组和基于订阅的多播应用程序将成将来智能无线应用程序的主要模型。
Peer groups and subscription-based multicast applications will be a major model for the smart wireless applications of the future.
在讨论广播和多播之前，先看看简单的基于UDP的服务器框架(清单6)。
Before delving into the topics of broadcast and multicast, however, look at a simple UDP-based server framework (see Listing 6).
这阻止您将Corosync 用作您的通信层，因为它需要多播或广播。
This prevents you from using Corosync as your communication layer; it requires multicast or broadcast.
我现在可以实施和支持多播委托多，单一的委托类的定义更加容易。
I can now implement and support a multicast delegate much easier in one single delegate class definition.
在多播中，信息包能被送到网络组里的各个地址，而不是单个的地址。
In multicasting, packets can be sent to groups of Network addresses, instead of individual addresses.
可在同一端口上创建多个客户端，它们可加入多播组来接收来自服务器的数据报。
Multiple clients can also be created on the same port and joined to the multicast group to receive the datagrams sent from the server.
可在同一端口上创建多个客户端，它们可加入多播组来接收来自服务器的数据报。
Multiple clients can also be created on the same port and joined to the multicast group to receive the datagrams sent from the server.
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