命令行说明

• TX errors = CRC, checksum mismatch
• Frame = Packet fails to end on a 32bit/4 byte boundary
  • Not sure if this includes small packets ( <64bytes ) or large packets.
• Collisions = This interface is running half duplex.
  • It is detecting TX and RX packets at the same time.
  • This is bad in a HDuplex environment (Hubs)
  • Switched environments operate full duplex.
  • Collision detection is disabled in FD mode.
  • A mismatch in duplex is very bad for throughput.
  • (Switch = FD but Host = HD)
  • The HDuplex device will terminate transmission if collisions are detected.
  • Some devices used to report late collisions which were very bad in hub environments.
• Carrier = Loss of link pulse. Sometimes recreated by removing and installing the Ethernet cable.
  • If this counter is high, the link is flapping. (up/down)
  • Either this Ethernet chip is having issues or the device at the other end of the cable is having issues
• Overruns = The NIC has a Buffer of X bytes and this filled and was exceeded before the buffer could be emptied.
  • The Excess is the overrun.