rwpdedupe(1) SiLK Tool Suite rwpdedupe(1)NAMErwpdedupe - Eliminate duplicate packets collected by several sensors
SYNOPSISrwpdedupe { --first-duplicate | --random-duplicate[=SCALAR] }
[--threshold=MILLISECONDS] FILE... > OUTPUT-FILE
rwpdedupe--help
rwpdedupe--version
DESCRIPTION
Detects and eliminates duplicate records from tcpdump(1) capture files.
Duplicate records are defined as having timestamps within a user-
configurable time of each other. In addition, their Ethernet (OSI
layer 3) headers must match. If they are not IP packets, then their
entire Ethernet payload must match. If they are IP packets, then their
source and destination addresses, protocol, and IP payload must match.
OPTIONS
Option names may be abbreviated if the abbreviation is unique or is an
exact match for an option. A parameter to an option may be specified
as --arg=param or --arg param, though the first form is required for
options that take optional parameters.
--threshold=MILLISECONDS
Set the maximum number of milliseconds which may elapse between two
packets and still have those packets be detected as duplicates.
Default 0 (exact timestamp match). Must be a value between 0 and
1,000,000 milliseconds.
One and only one of the following switches is required:
--first-duplicate
When selecting between multiple duplicate packets, always choose
the packet with the earliest timestamp. Not compatible with
--random-duplicate.
--random-duplicate
--random-duplicate=SCALAR
Select a random packet from the list of duplicate packets. SCALAR
is a random number seed, so that multiple runs can produce
identical results.
--help
Print the available options and exit.
--version
Print the version number and information about how SiLK was
configured, then exit the application.
EXAMPLES
In the following example, the dollar sign ("$") represents the shell
prompt. The text after the dollar sign represents the command line.
Lines have been wrapped for improved readability, and the back slash
("\") is used to indicate a wrapped line.
Given tcpdump files data1.tcp and data2.tcp, detect and eliminate
duplicate packets which occur within one second of each other (when
choosing which timestamp to output, pick one randomly.) Store the
result file in out.tcp.
$ rwpdedupe --threshold=1000 --random-duplicate \
data1.tcp data2.tcp > out.tcp
SEE ALSOmergecap(1), tcpdump(1), pcap(3)NOTESmergecap(1) can be used to merge two tcpdump capture files without
eliminating duplicate packets.
SiLK 3.11.0.1 2016-02-19 rwpdedupe(1)
