ping

ping 是测试网络连接状况以及信息包发送和接收状况的非常有用的工具.是网络测试最常用的命令.

ping 向目标主机(地址) 发送一个回送请求数据包,要求目标主机收到请求后给予答复,从而判断网络的响应时间以及本机是否与目标主机(地址)连通.

ping 目的地址 [-t] [-a] [-n count] [-l size] 

可以用 ping /?来显示帮助内容

ping 错误信息几种:

C:/Documents and Settings/Administrator>ping 172.18.14.1

Pinging 172.18.14.1 with 32 bytes of data:

Reply from 172.18.6.254: TTL expired in transit.
Reply from 172.18.6.254: TTL expired in transit.
Reply from 172.18.6.254: TTL expired in transit.
Reply from 172.18.6.254: TTL expired in transit.

Ping statistics for 172.18.14.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

Reply   from   xxx.xxx.xxx.xxx:Destination   host   unreachable  

(待续)