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clj-net-pcap is a wrapper/adapter/facade (No matter how you want to call it.) around jNetPcap that enables and eases packet capturing with Clojure.

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clj-net-pcap is currently available for Linux and Windows for both x86 and x86_64 architecture.

Please note that clj-net-pcap requires native packet capturing libraries. For Linux, this is the libpcap library. For Windows, this is the winpcap library. Typically, these libraries have to be installed separately. On Linux, this is usually done via the packet manager of the respective distribution.

When using clj-net-pcap via Leiningen or Maven, all Java/Clojure related dependencies should be resolved and pulled in automatically.

Additionally, please note that on Linux clj-net-pcap expects the libpcap library to be named "". If this is not the case this can be fixed by, e.g., adding a symbolic link like shown for Fedora below:

sudo ln -s /usr/lib64/ /usr/lib64/


clj-net-pcap is primarily intended as a library that is used by other applications. However, it can be run as sample stand-alone command line application as follows:

java -jar clj-net-pcap-standalone-jar-file.jar

For more information about the available options use the "-h" or "--help" option.

API Docs

API docs are available:

Detailed Test Results

Detailed results of unit tests are available:


We published two papers in which we describe the clj-net-pcap architecture and implementation and assess the performance:


If you want to reference clj-net-pcap, you can refer to our paper, e.g., in LaTeX:

    title = {Improving {Network} {Traffic} {Acquisition} and {Processing} with the {Java} {Virtual} {Machine}},
    booktitle = {2015 20th {IEEE} {Symposium} on {Computers} and {Communications} ({ISCC})},
    author = {Gad, Ruediger and Kappes, Martin and Medina-Bulo, Immaculada},
    month = jul,
    year = {2015},
    note = {in press},

    author={Gad, Ruediger and Kappes, Martin and Medina-Bulo, Inmaculada},
    booktitle={Computer Software and Applications Conference Workshops (COMPSACW), 2014 IEEE 38th International},
    title={Bridging the Gap between Low-Level Network Traffic Data Acquisition and Higher-Level Frameworks},
    keywords={Data acquisition;Instruction sets;Java;Libraries;Pipelines;Prototypes;Surveillance;Java Virtual Machine;Networks;Packet Capturing;Performance},

Building etc.

clj-net-pcap uses Leiningen. Please note that Leiningen version 2.x is used.

History & Acknowledgements

clj-net-pcap was created and is still developed and maintained as a personal project. However, I am in the fortunate situation that it showed after some time that clj-net-pcap could also be used for my PhD and research work. While I did the actual development in my spare time, I worked on the scientific evaluation of clj-net-pcap and published these results in scientific papers in scope of my employment as PhD student and researcher. Consequently, acknowledgements go to my employer the Frankfurt University of Applied Sciences and the Universidad de Cádiz where I am currently enrolled as PhD student.

While the project name was initially "cljNetPcap", it was renamed to "clj-net-pcap" in order to adhere to common package naming conventions. Furthermore, I decided to upload clj-net-pcap to in order to ease its application.


Copyright (C) 2012, 2013, 2014, 2015 Ruediger Gad

clj-net-pcap is licensed under the terms of either

or, at your option,

By contributing to clj-net-pcap, you agree that your contribution will be licensed under both licenses and that users of clj-net-pcap can chose any of these licenses.


clj-net-pcap is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (LGPL) as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

clj-net-pcap is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License (LGPL) for more details.

You should have received a copy of the GNU Lesser General Public License (LGPL) along with clj-net-pcap. If not, see


clj-net-pcap is is released under the terms of the Eclipse Public License (EPL) 1.0. You can find a copy of the EPL at:


A wrapper/facade/whatever to enable/ease the use of jNetPcap (a libpcap based packet sniffing lib) in Clojure



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