tcpreplay - Online in the Cloud

PROGRAM:

NAME

tcpreplay - Replay network traffic stored in pcap files

SYNOPSIS

tcpreplay [-flag [value]]... [--opt-name [[=| ]value]]...
<pcap_file(s)>

tcpreplay is a tool for replaying network traffic from files saved with tcpdump or other
tools which write pcap(3) files.

DESCRIPTION

This manual page briefly documents the tcpreplay command. The basic operation of
tcpreplay is to resend all packets from the input file(s) at the speed at which they
were recorded, or a specified data rate, up to as fast as the hardware is capable.

Optionally, the traffic can be split between two interfaces, written to files, filtered
and edited in various ways, providing the means to test firewalls, NIDS and other network
devices.

For more details, please see the Tcpreplay Manual at:
http://tcpreplay.synfin.net/trac/wiki/manual

OPTIONS

-d number, --dbug=number
Enable debugging output. This option may appear up to 1 times. This option takes
an integer number as its argument. The value of number is constrained to being:
in the range 0 through 5
The default number for this option is:
0

If configured with --enable-debug, then you can specify a verbosity level for
debugging output. Higher numbers increase verbosity.

-q, --quiet
Quiet mode.

Print nothing except the statistics at the end of the run

-T string, --timer=string
Select packet timing mode: select, ioport, rdtsc, gtod, nano, abstime. This option
may appear up to 1 times. The default string for this option is:
gtod

Allows you to select the packet timing method to use:

nano - Use nanosleep() API

select - Use select() API

ioport - Write to the i386 IO Port 0x80

rdtsc - Use the x86/x86_64/PPC RDTSC

gtod [default] - Use a gettimeofday() loop

abstime - Use OS X's AbsoluteTime API

--sleep-accel=number
Reduce the amount of time to sleep by specified usec. This option takes an integer
number as its argument. The default number for this option is:
0

Reduce the amount of time we would normally sleep between two packets by the
specified number of usec. This provides a "fuzz factor" to compensate for running
on a non-RTOS and other processes using CPU time. Default is disabled.

--rdtsc-clicks=number
Specify the RDTSC clicks/usec. This option may appear up to 1 times. This option
takes an integer number as its argument. The default number for this option is:
0

Override the calculated number of RDTSC clicks/usec which is often the speed of the
CPU in Mhz. Only useful if you specified --timer=rdtsc

-v, --verbose
Print decoded packets via tcpdump to STDOUT. This option may appear up to 1 times.

-A string, --decode=string
Arguments passed to tcpdump decoder. This option may appear up to 1 times. This
option must appear in combination with the following options: verbose.

When enabling verbose mode (-v) you may also specify one or more additional
arguments to pass to tcpdump to modify the way packets are decoded. By default, -n
and -l are used. Be sure to quote the arguments like: -A "-axxx" so that they
are not interpreted by tcpreplay. Please see the tcpdump(1) man page for a
complete list of options.

-K, --enable-file-cache
Enable caching of packets to internal memory. This option must appear in
combination with the following options: loop.

Cache pcap file(s) the first time they are cached in RAM so that subsequent loops
don't incurr any disk I/O latency in order to increase performance. Make sure you
have enough free RAM to store the entire pcap file(s) in memory or the system will
swap and performance will suffer.

--preload-pcap
Preloads packets into RAM before sending.

This option loads the specified pcap(s) into RAM before starting to send in order
to improve replay performance while introducing a startup performance hit.
Preloading can be used with or without --loop and implies --enable-file-cache.

-c string, --cachefile=string
Split traffic via a tcpprep cache file. This option may appear up to 1 times.

-i string, --intf1=string
Server/primary traffic output interface. This option may appear up to 1 times.

-I string, --intf2=string
Client/secondary traffic output interface. This option may appear up to 1 times.
This option must appear in combination with the following options: cachefile.

--listnics
List available network interfaces and exit.

-l number, --loop=number
Loop through the capture file X times. This option may appear up to 1 times. This
option takes an integer number as its argument. The value of number is constrained
to being:
greater than or equal to 0
The default number for this option is:
1

--pktlen
Override the snaplen and use the actual packet len. This option may appear up to 1
times.

By default, tcpreplay will send packets based on the size of the "snaplen" stored
in the pcap file which is usually the correct thing to do. However, occasionally,
tools will store more bytes then told to. By specifying this option, tcpreplay
will ignore the snaplen field and instead try to send packets based on the original
packet length. Bad things may happen if you specify this option.

-L number, --limit=number
Limit the number of packets to send. This option may appear up to 1 times. This
option takes an integer number as its argument. The value of number is constrained
to being:
greater than or equal to 1
The default number for this option is:
-1

By default, tcpreplay will send all the packets. Alternatively, you can specify a
maximum number of packets to send.

-x string, --multiplier=string
Modify replay speed to a given multiple. This option may appear up to 1 times.
This option must not appear in combination with any of the following options: pps,
mbps, oneatatime, topspeed.

Specify a floating point value to modify the packet replay speed. Examples:
2.0 will replay traffic at twice the speed captured
0.7 will replay traffic at 70% the speed captured

-p number, --pps=number
Replay packets at a given packets/sec. This option may appear up to 1 times. This
option must not appear in combination with any of the following options:
multiplier, mbps, oneatatime, topspeed. This option takes an integer number as its
argument.

-M string, --mbps=string
Replay packets at a given Mbps. This option may appear up to 1 times. This option
must not appear in combination with any of the following options: multiplier, pps,
oneatatime, topspeed.

Specify a floating point value for the Mbps rate that tcpreplay should send packets
at.

-t, --topspeed
Replay packets as fast as possible. This option must not appear in combination
with any of the following options: mbps, multiplier, pps, oneatatime.

-o, --oneatatime
Replay one packet at a time for each user input. This option must not appear in
combination with any of the following options: mbps, pps, multiplier, topspeed.

Allows you to step through one or more packets at a time.

--pps-multi=number
Number of packets to send for each time interval. This option must appear in
combination with the following options: pps. This option takes an integer number
as its argument. The value of number is constrained to being:
greater than or equal to 1
The default number for this option is:
1

When trying to send packets at very high rates, the time between each packet can be
so short that it is impossible to accurately sleep for the required period of time.
This option allows you to send multiple packets at a time, thus allowing for longer
sleep times which can be more accurately implemented.

-P, --pid
Print the PID of tcpreplay at startup.

--stats=number
Print statistics every X seconds. This option takes an integer number as its
argument. The value of number is constrained to being:
greater than or equal to 1

Note that this is very much a "best effort" and long delays between sending packets
may cause equally long delays between printing statistics.

-V, --version
Print version information.

-h, --less-help
Display less usage information and exit.

-H, --help
Display usage information and exit.

-!, --more-help
Extended usage information passed thru pager.

- [rcfile], --save-opts[=rcfile]
Save the option state to rcfile. The default is the last configuration file listed
in the OPTION PRESETS section, below.

- rcfile, --load-opts=rcfile, --no-load-opts
Load options from rcfile. The no-load-opts form will disable the loading of
earlier RC/INI files. --no-load-opts is handled early, out of order.

OPTION PRESETS

Any option that is not marked as not presettable may be preset by loading values from
configuration ("RC" or ".INI") file(s). The homerc file is "$$/", unless that is a
directory. In that case, the file ".tcpreplayrc" is searched for within that directory.

SIGNALS

tcpreplay understands the following signals:

SIGUSR1 Suspend tcpreplay

SIGCONT Restart tcpreplay

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