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Special Forums IP Networking tcpdump -w: how to reduce disk space ? Post 302330715 by Calimero90 on Thursday 2nd of July 2009 06:09:17 AM
Old 07-02-2009
tcpdump -w: how to reduce disk space ?

Hello !

I am using
tcpdump -w /tr.cap -p -n -s 0 "udp"
to trace my network trafic.
(analysing later)

I want to reduce the size of the trace files.
Firtst i can use the great -C option but old files are not deleted...
Second I don't want trace RTP packet but i can't find how to use ("not rtp" , "udp.port < 10000"...)

Idealy i want trace only few firsts bytes of RTP but all bytes of other...

Any idea ?
Thanks
 

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TRACE-CMD-START(1)														TRACE-CMD-START(1)

NAME
trace-cmd-start - start the Ftrace Linux kernel tracer without recording SYNOPSIS
trace-cmd start [OPTIONS] DESCRIPTION
The trace-cmd(1) start enables all the Ftrace tracing the same way trace-cmd-record(1) does. The difference is that it does not run threads to create a trace.dat file. This is useful just to enable Ftrace and you are only interested in the trace after some event has occurred and the trace is stopped. Then the trace can be read straight from the Ftrace pseudo file system or can be extracted with trace-cmd-extract(1). OPTIONS
The options are the same as trace-cmd-record(1), except that it does not take options specific to recording (-s, -o, -F, -N, and -t). SEE ALSO
trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1), trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1) AUTHOR
Written by Steven Rostedt, <rostedt@goodmis.org[1]> RESOURCES
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git COPYING
Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL). NOTES
1. rostedt@goodmis.org mailto:rostedt@goodmis.org 06/11/2014 TRACE-CMD-START(1)
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