Ping功能是基于ICMP协议来实现的：源端向目的端发送ICMP回显请求（ECHO-REQUEST）报文后，根据是否收到目的端的ICMP回显应答（ECHO-REPLY）报文来判断目的端是否可达，对于可达的目的端，再根据发送报文个数、接...
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ERQ Echo ReQuest 回响请求
Echo Request 回应要求 ; 回显请求 ; 回应请求
Echo request and reply 回显请求和应答
Echo request or reply 回应请求和应答
echo request packet 回应请求包
ECHO REQUEST PICK 应答请求拣取器
ECHO REQUEST STRING 应答请求字符行输入器
ECHO REQUEST CHOICE 应答请求选值器
The server's response to this request does not echo any data, so the jQuery response function is empty (and could actually have been removed).
服务器对该请求的响应不会回传任何数据，因此 jQuery 响应函数为空（并且实际上可以被移除）。
In the simplest form, you can send an echo request to a host and find out the response time (see Listing 1).
按照最简单的形式，可以向一个主机发送echo请求并查明响应时间(见清单1)。
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。
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