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The following is an example of using the -i option, and Table 24.9 explains each field in the listing.


$ netstat -i

Kernel Interface table

Iface  MTU Met  RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR

Flags	

lo     2000  0      0       0      0      0  1558      1      0     0

LRU
Table 24.9 Fields in the Kernel Interface Table
Field Description
Iface The name of the network interface.
MTU The largest number of bytes that can be sent in one transmission by this interface.
Met The metric value for this interface.
RX-OK The number of packets received with no errors.
RX-ERR The number of packets received with errors.
RX-DRP The number of packets dropped.
RX-OVR The number of packet overrun errors.
TX-OK The number of packets transmitted with no errors.
TX-ERR The number of packets transmitted with errors.
TX-DRP The number of packets dropped during transmission.
TX-OVR The number of packets dropped due to overrun errors.
Flags The following flags can be shown in this field:
A The interface receives packets for multicast addresses.
B The interface receives broadcast packets.
D The interface debugging feature is now activated.
L This is the loopback interface.
M The interface is in promiscuous mode.
N The interface doesn’t process trailers on packets.
O The Address Resolution Protocol is turned off on this interface.
P This interface is being used as a point-to-point connection.
R The interface is running.
U The interface has been activated.

From Here…

This chapter covers the basics of configuring a Linux machine for use on a network. More information can be found in the man pages for the discussed commands. For more information on TCP/IP networking and configuration, see the following chapters:

•  Chapter 18, “Understanding Linux Shells,” gives more details on writing shell scripts.
•  Chapter 23, “Understanding the TCP/IP Protocol Suite,” explains the details of the TCP/IP protocols.
•  Chapter 25, “Configuring Domain Name Service,” shows you how to set up Linux as a DNS client and server.


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