TCP/IP学习笔记（三）

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一、Ping程序：

　　先看：

      //ping
      C:\WINNT\system32>ping svr00804
      Pinging svr00804.sccnj.swirebev.com [192.1.8.12] with 32 bytes of data:
      Reply from 192.1.8.12: bytes=32 time<10ms TTL=128
      Reply from 192.1.8.12: bytes=32 time<10ms TTL=128
      Reply from 192.1.8.12: bytes=32 time<10ms TTL=128
      Reply from 192.1.8.12: bytes=32 time<10ms TTL=128
      Ping statistics for 192.1.8.12:
      Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
      Approximate round trip times in milli-seconds:
      Minimum = 0ms, Maximum =  0ms, Average =  0ms       

ICMP回显请求和回显应答报文格式如下：（以Ping为例）

　

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