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TRPT(8)			FreeBSD	System Manager's Manual		       TRPT(8)

     trpt -- transliterate protocol trace

     trpt [-afjst] [-M core] [-N system] [-p hex-address]

     trpt interrogates the buffer of TCP trace records created when a socket
     is	marked for "debugging" (see setsockopt(2)), and	prints a readable de-
     scription of these	records.  When no options are supplied,	trpt prints
     all the trace records found in the	system grouped according to TCP	con-
     nection protocol control block (PCB).

     The options are as	follows:

     -a	     In	addition to the	normal output, print the values	of the source
	     and destination addresses for each	packet recorded.

     -f	     Follow the	trace as it occurs, waiting a short time for addi-
	     tional records each time the end of the log is reached.

     -j	     Just give a list of the protocol control block addresses for
	     which there are trace records.

     -M	core
	     Extract values associated with the	name list from core instead of
	     the running kernel.

     -N	system
	     Extract the name list from	system instead of the running kernel.

     -p	hex-address
	     Show only trace records associated	with the protocol control
	     block at the given	address	hex-address.

     -s	     In	addition to the	normal output, print a detailed	description of
	     the packet	sequencing information.

     -t	     In	addition to the	normal output, print the values	for all	timers
	     at	each point in the trace.

     The recommended use of trpt is as follows.	 Isolate the problem and en-
     able debugging on the socket(s) involved in the connection.  Find the ad-
     dress of the protocol control blocks associated with the sockets using
     the -A option to netstat(1).  Then	run trpt with the -p option, supplying
     the associated protocol control block addresses.  The -f option can be
     used to follow the	trace log once the trace is located.  If there are
     many sockets using	the debugging option, the -j option may	be useful in
     checking to see if	any trace records are present for the socket in	ques-

     trpt requires the ability to open /dev/kmem which may be restricted based
     upon the value of the kern.allowkmem sysctl(8).

     no	namelist
	     When the system image doesn't contain the proper symbols to find
	     the trace buffer; others which should be self explanatory.

     netstat(1), setsockopt(2)

     The trpt command appeared in 4.2BSD.

     Should also print the data	for each input or output, but this is not
     saved in the trace	record.

     The output	format is inscrutable and should be described here.

FreeBSD	13.0		      September	25, 2016		  FreeBSD 13.0


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