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  • MindMap
  • IP Header
  • IP路由
  • 特殊情况的IP地址
  • netstat

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ch03: Internet Protocol

IP

Previousch02: Link LayerNextch04: Address Resolutin Protocol

Last updated 4 years ago

Was this helpful?

MindMap

IP: Internet Protocol

IP Header

注意：checksum只对IP Header进行校验。

IP路由

路由表：

  • 目的IP地址。可以是主机地址，也可以是网络地址；

  • 下一跳的IP地址；

  • Flag，更多的信息；

  • 传输datagram的网络接口。

路由选择：

  • 查找完全匹配的IP地址，如果找到了直接发送；

  • 找不到的话，查找匹配的网络地址；

  • 找default；

  • 目标不可达。

一个例子：

子网与子网掩码

特殊情况的IP地址

netstat

查看系统上的网络接口信息。-i选项打印出接口信息，-n选项打印IP地址而不是hostname：

$ netstat -in
Kernel Interface table
Iface      MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth1      1500  3484713      0      0 0       3501905      0      0      0 BMRU
lo       65536   813519      0      0 0        813519      0      0      0 LRU
tunnat    1480        0      0      0 0         66702      0      0      0 OPRU
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