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NETSTAT NETSTAT ( 1 )
the destination of the route is a host. The D flag indicates that the route is
dynamic. The U flag indicates that the route is up. The -n option disables the
symbolic translation of the network and interface addresses, causing both to be
displayed in their Internet dot notation. Note that the reference count will always
be zero since the kernel routing functions do not yet track this statistic.
The network statistics display (-s) shows the current values of the statistics main-
tained by the kernel for each protocol. This display includes statistics for the ip,
icmp, tcp, and udp protocols. The -p protocol option will show only those statistics
for the specified protocol. The -r option will show routing statistics.
The STREAMS display (-S) shows the number of failed requests for STREAMS
buffers, by the size of the requested buffer, for each TCP/IP kernel STREAMS
module or driver. Note that no entry will appear for the character driver w_, since
it is not a STREAMS driver. The display is a matrix, containing a line for every
kernel module or driver. The columns represent buffer lengths, in bytes, rounded
up to the nearest power of two. Each failed request increments the counter for the
associated buffer size. The counters are reset only when the system is rebooted.
The packet traffic display is a running summary of packet transmission statistics.
This display is selected by calling netstat with a single numeric argument indicat-
ing the frequency with which the display is to be updated. No options can be
used with this display. This display includes the numbers of inbound and out-
bound packets and errors for the most active interface and the total for all inter-
faces. The first line of each screen of information contains a summary since the
network was last brought up. Subsequent lines show values accumulated over the
preceding interval.
DIAGNOSTICS
Exit status is zero for normal termination, a positive number for error termination.
The message can’t open device in the STREAMS display indicates that netstat can-
not open the device to obtain the requested statistics, either because the module or
device has not been configured into the kernel or because all of the allocated
minor devices are already in use.
FILES
hosts(4), networks(4), protocols(4), services(4)
SEE ALSO
named(1M), route(1M), routed(1M)
Issue 3 E-29