.TH tcpstat.d 1m "May 15, 2005" "version 0.70" "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 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)