netstat -i 给定接口(interface)的度量值是什么意思？

Question

当使用 netstat -i 时，您会得到类似于以下示例的输出:

  Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
  eth0       1500 0       214      0      0 0           139      0      0      0 BMRU
  eth1       1500 0       656      0      0 0            34      0      0      0 BMRU
  lo        16436 0         0      0      0 0             0      0      0      0 LRU

根据 Linux 网络管理员指南 http://tldp.org/LDP/nag2/x-087-2-iface.netstat.html

The MTU and Met fields show the current MTU and metric values for that interface. The RX and TX columns show how many packets have been received or transmitted error-free (RX-OK/TX-OK) or damaged (RX-ERR/TX-ERR); how many were dropped (RX-DRP/TX-DRP); and how many were lost because of an overrun (RX-OVR/TX-OVR).

给定接口(interface)的指标值到底是什么意思？

Answer 1

它确定首选路由，以防同一主机有多个路由。操作系统将采用较低指标的路径。
这通常是路由守护程序(如果您使用动态路由)所担心的事情。