DistributedNetworks DistributedNetworks


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Lesson 6Determining how interfaces are being used
Objective Use netstat Command to provide statistics on how different network interfaces are being used

netstat Command to provide Statistics

The netstat command will provide a statistical picture of how the different network interfaces available on your machine are being used:
View the diagram below to see how the netstat -i command is used to determine how interfaces are being used. Netstat output varies slightly from machine to machine; thus, slightly different output may appear under other versions of UNIX.
Interface name
  1. Interface name
  2. Maximum transmission unit for this interface—largest size is a link-layer frame.
  3. Metric. An artificial number used for routing decisions.
  4. Number of frames received successfully (RX-OK). Number of errors (RX-ERR). Number of frames dropped (RX-DRP). Number of buffer overruns (RX-OVR).
  5. Number of frames sent successfully (TX-OK). Number of errors (TX-ERR). Number of frames dropped (TX-DRP). Number of buffer overruns (TX-OVR).
  6. U=Up, B=Broadcast, R=Running, L=Loopback
How Interfaces are used
Of particular interest in this output is the number of errors of various types (RX-ERR, TX-ERR, and so on.) High values for these numbers could mean a congested network or other traffic problems.

netstat Connections - Quiz

Click the Quiz link below to take a short multiple-choice quiz on netstat.
netstat Connections - Quiz