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About The Book

Source for TCP Congestion Control: A Systems Approach is available on GitHub under terms of the Creative Commons (CC BY-NC-ND 4.0) license. The community is invited to contribute corrections, improvements, updates, and new material under the same terms. While this license does not automatically grant the right to make derivative works, we are keen to discuss derivative works (such as translations) with interested parties. Please reach out to

If you make use of this work, the attribution should include the following information:

Title: TCP Congestion Control: A Systems Approach
Authors: Larry Peterson, Lawrence Brakmo, and Bruce Davie

Read the Book

This book is part of the Systems Approach Series, with an online version published at

To track progress and receive notices about new versions, you can follow the project on Facebook and Mastodon. To read a running commentary on how the Internet is evolving, follow the Systems Approach Newsletter.

Build the Book

To build a web-viewable version, you first need to download the source:

$ mkdir ~/systemsapproach
$ cd ~/systemsapproach
$ git clone
$ cd tcpcc

The build process is stored in the Makefile and requires Python be installed. The Makefile will create a virtualenv (venv-docs) which installs the documentation generation toolset. You may also need to install the enchant C library using your system’s package manager for the spelling checker to function properly.

To generate HTML in _build/html, run make html.

To check the formatting of the book, run make lint.

To check spelling, run make spelling. If there are additional words, names, or acronyms that are correctly spelled but not in the dictionary, please add them to the dict.txt file.

To see the other available output formats, run make.

Contribute to the Book

We hope that if you use this material, you are also willing to contribute back to it. If you are new to open source, you might check out this How to Contribute to Open Source guide. Among other things, you’ll learn about posting Issues that you’d like to see addressed, and issuing Pull Requests to merge your improvements back into GitHub.

If you’d like to contribute and are looking for something that needs attention, see the wiki for the current TODO list.