定义从单工数据报处理消息时所需的接口。
Defines the interface required to process messages from simplex session channels.
通常，ICMP用来报告主机上数据报处理中的错误。
Typically, ICMP is used to report errors in datagram processing on a host. Some functions of ICMP include.
Protocol还处理使用数据报或串行端口连接的消息发送与接收。
Protocol also handles the sending and receiving of messages using a datagram or serial port connection.
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