Tcpdump is a very powerful command line interface packet sniffer.

tcpdumpTcpdump is a a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

 

In this page, you'll find the latest stable version of tcpdump and libpcap, as well as current development snapshots, a complete documentation, and information about how to report bugs or contribute patches.

 

Latest Release.

Version: 4.4.0 / 1.4.0
Release Date: May 20, 2013

Version: 4.3.0 / 1.3.0
Release Date: June 12, 2012

The current development version is freely accessible through the anonymous GIT server. To checkout a copy of libpcap or tcpdump, do:

 

git clone git://bpf.tcpdump.org/tcpdump

git clone git://bpf.tcpdump.org/libpcap

 

One can then configure and compile the source via the normal GNU autoconf method. You can also find a nightly update at git hub: libpcap and git hub: tcpdump and you are encouraged to do your initial clone from there:

 

git clone https://github.com/the-tcpdump-group/libpcap.git

git clone https://github.com/the-tcpdump-group/tcpdump.git

 

You are also encouraged to submit patches in the form of git trees hosted on github or elsewhere.

 

Install.

1. TCPDUMP DOWNLOAD:
To download TCPdump:

 

#apt-get install tcpdump

To see the TCPdump dependencies:

 

#apt-cache depends tcpdump

tcpdump
   Depends: libc6
   Depends: libpcap0.8
   Depends: libssl0.9.8

To see the installed TCPdump version:

 

#apt-cache policy tcpdump

tcpdump2

tcpdump:
   Installed: 3.9.4-2ubuntu0.1
Candidate: 3.9.4-2ubuntu0.1
   Version table:
  *** 3.9.4-2ubuntu0.1 0
            500 http://security.ubuntu.com dapper-security/main Packages
            100 /var/lib/dpkg/status
         3.9.4-2 0
            500 http://ch.archive.ubuntu.com dapper/main Packages

 

2. TCPDUMP SYNTAX

Syntax:

Protocol

Direction

Host(s)

Value

Logical Operations

Other expression

Example:

tcp

dst

10.1.1.1

80

and

tcp dst 10.2.2.2 3128

 

 

Protocol:
Values: ether, fddi, ip, arp, rarp, decnet, lat, sca, moprc, mopdl, tcp and udp.
If no protocol is specified, all the protocols are used.


Direction:
Values: src, dst, src and dst, src or dst
If no source or destination is specified, the "src or dst" keywords are applied.
For example, "host 10.2.2.2" is equivalent to "src or dst host 10.2.2.2".


Host(s):
Values: net, port, host, portrange.
If no host(s) is specified, the "host" keyword is used.
For example, "src 10.1.1.1" is equivalent to "src host 10.1.1.1".


Logical Operations:
Values: not, and, or.
Negation ("not") has highest precedence. Alternation ("or") and concatenation ("and") have equal precedence and associate left to right.
For example,
"not tcp port 3128 and tcp port 23" is equivalent to "(not tcp port 3128) and tcp port 23".
"not tcp port 3128 and tcp port 23" is NOT equivalent to "not (tcp port 3128 and tcp port 23)".

tcpdump-output-file-networknuts

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