tcpstat.d - print TCP statistics. Uses DTrace. tcpstat.d 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.oracle.com/cd/E23824_01/html/E22973. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris stable - needs the mib provider.

Print statistics every second, # tcpstat.d

TCP_out TCP bytes sent

TCP_outRe TCP bytes retransmitted

TCP_in TCP bytes received

TCP_inDup TCP bytes received duplicated

TCP_inUn TCP bytes received out of order

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. tcpstat.d will run forever until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] nicstat(1M), dtrace(1M)