TCPdump

Description

tcpdump is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license.

Syntax

tcp dump [-aAbdDefhHIJKlLnNOpqRStuUvxX] [ -B size ] [ -c count ]
[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
[ -i interface ] [ -j tstamptype ] [ -M secret ]
[ -P in|out|inout ]
[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]
[ -W filecount ] [ -y datalinktype ] [ -z command ]
[ -Z user ] [ expression ]

Example

cyborg@cyborg:~$ tcpdump -w out -c 16
tcp dump: listening on bluetooth0, link-type BLUETOOTH_HCI_H4_WITH_PHDR (Bluetooth HCI UART transport layer plus pseudo-header), capture size 65535 bytes
16 packets captured
1231 packets received by filter
0 packets dropped by kernel

cyborg@cyborg:~$ cat out
����� V��re!�z
                          Z�� V

                                �w3��
                                            >�� V� ʬ��,�
                                                               Z�� V�� VS=

                                                                               ��� V���w3��
                       > VS��re!�z
                                          Z V�
                                               �w3��
                                                            > Vʬ��,�
                                                                             Z V VyF

           � V�
                     ʬ��,�
                                Z V�w3��
                                                 >�� V��re!�z
                                                                    Z�� V��w3��
       >�� V�ʬ��,�

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