.TH tcpstat.d 1m  "$Date:: 2007-08-05 #$" "USER COMMANDS"
.SH NAME
tcpstat.d \- print TCP statistics. Uses DTrace.
.SH SYNOPSIS
.B tcpstat.d
.SH DESCRIPTION
tcpstat.d is a DTrace program to print TCP statistics every second,
retrieved from the MIB provider.

This program can be used to help identify how utilised the network 
interfaces may be, as well as TCP transmission errors.

The TCP statistics are documented in the mib2_tcp struct
in /usr/include/inet/mib2.h; and also in the mib provider
chapter of the DTrace Guide, found at 
http://docs.sun.com/db/doc/817-6223.

Since this uses DTrace, only the root user or users with the
dtrace_kernel privilege can run this command.
.SH OS
Solaris
.SH STABILITY
stable - needs the mib provider.
.SH EXAMPLES
.TP
Print statistics every second,
# 
.B tcpstat.d
.PP
.SH FIELDS
.TP
TCP_out
TCP bytes sent
.TP
TCP_outRe
TCP bytes retransmitted
.TP
TCP_in
TCP bytes received
.TP
TCP_inDup
TCP bytes received duplicated
.TP
TCP_inUn
TCP bytes received out of order
.PP
.SH DOCUMENTATION
See the DTraceToolkit for further documentation under the 
Docs directory. The DTraceToolkit docs may include full worked
examples with verbose descriptions explaining the output.
.SH EXIT
tcpstat.d will run forever until Ctrl\-C is hit. 
.SH AUTHOR
Brendan Gregg
[Sydney, Australia]
.SH SEE ALSO
nicstat(1M), dtrace(1M)