ping命令和ttl值介绍.ppt

Ping命令及TTL值介绍
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Ping命令概述
Ping程序实际就是发送一个ICMP回显请求报文给目的主机,并等待回显的ICMP应答。然后打印出回显的报文。Ping不通一个地址,并不一定表示这个IP不存在或者没有连接在网络上,因为对方主机可能做了限制,比如安装了防火墙,连接。
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Ping的目的
Ping主机的IP地址—检验本地主机的TCPIIP地址配置
ping默认网关IP地址---检验连接本地网络和其他网络的路由器是否可达。
ping远端目的地的IP地址----检验与远端主机的连通性
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Ping常用参数介绍
ping [-t] [-a] [-n count] [-l length] [-f] [-i ttl] [-v tos] [-r count] [-s count] [[-puter-list] | [-puter-list]] [-w timeout] destination-list
-t ping 指定的计算机直到中断。ctrl+c停止
-a 将地址解析为计算机名
-n count 发送 count 指定的 echo 数据包数。默认值为 4
-i ttl 将“生存时间”字段设置为 ttl 指定的值
-l length 发送包含由 length 指定的数据量的 echo 数据
包。默认为 32 字节;最大值是 65,527
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ping -a
Pinging .com [] with 32 bytes of data:
Reply from : bytes=32 time=69ms TTL=244
Reply from : bytes=32 time=78ms TTL=244
Reply from : bytes=32 time=78ms TTL=244
Reply from : bytes=32 time=77ms TTL=244
Ping statistics for :
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 69ms, Maximum = 78ms, Average = 75ms
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ping -t -l 10000
Pinging [] with 10000 bytes of data:
Reply from : bytes=10000 time=169ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=187ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Reply from : bytes=10000 time=171ms TTL=55
Ping statistics for :
Packets: Sent = 11, Received = 11, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 169ms, Maximum = 187ms, Average = 172ms
Control-C
^C
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ping -i 3
Pinging [] with 3