说到IGMP 不能不提“组播”的概念。假如现在一个主机想将一个数据包发给网络上的 若干主机，有什么方法可以做到呢？一个方法是采用广播包发送，这样网络上的所有主机都 能够接收到，另一种方式是将数据包复制若干份分别发给目的主机。这两个方法都存在问题： 方法一，广播的方法导致网络上所有的主机都能接收到，占用了网络上其他主机的资源。方 法二，由于所有目的主机接收的报文都是相同的，采用单播方式显然效率很低。为了解决上 面所述的问题，人们提出了“组播”的概念，控制一个报文发送给对该报文感兴趣的主机， IGMP 就是组播管理协议。

Packet : IGMP.rar filelist
IGMP.pdf

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