tcpdump
Dump traffic on a network
Syntax:
tcpdump [-AbdDefhHIJKlLnNOpqStuUvxX#] [-B buffer_size] [-c count]
[--count] [-C file_size][-E spi@ipaddr algo:secret,...]
[-F file] [-G rotate_seconds] [-i interface] [--immediate-mode]
[-j tstamp_type] [-m module] [-M secret] [--number] [--print]
[-Q in | out | inout] [-r file] [-s snaplen]
[-T type] [--version] [-V file] [-w file]
[-W filecount] [-y datalinktype] [-z postrotate-command]
[-Z user] [--time-stamp-precision=tstamp_precision]
[--micro] [--nano] [expression]
Runs on:
QNX OS
Options:
See the tcpdump documentation: https://www.tcpdump.org/manpages/tcpdump.1-4.99.1.html
Description:
The tcpdump utility prints a description of the contents of packets on a network interface that match the boolean expression. You can also run it with the -w option, which causes it to save the packet data to a file for later analysis, and/or with the -r option, which causes it to read from a saved packet file rather than to read packets from a network interface. In all cases, tcpdump processes only those packets that match expression.
This program uses the OpenSSL library for cryptography services.
For more information, see the tcpdump documentation: https://www.tcpdump.org/manpages/tcpdump.1-4.99.1.html
Contributing author:
The original authors are Van Jacobson, Craig Leres, and Steven McCanne, all of the Lawrence Berkeley National Laboratory, University of California, Berkeley, CA. The tcpdump utility is currently maintained by tcpdump.org.