Echo-request and echo-reply message format 回送请求和回送回答报文格式
The ICMP echo request failed because the source address and destination address that are specified in an ICMP echo message are not in the same scope.
由于ICM P回送消息中指定的源地址和目标地址不在同一范围内，ICM P回送请求失败。
Packet Internet Groper a program used to test whether a particular network destination is online, by sending an Internet control message protocol echo request and waiting for a response.
包因特网查询工具用于通过发送一个Internet控制消息协议回送请求并等待应答来测试一个特定网络目的地是否联机的一种程序。
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