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Dec 9, 2021

tirdad

tirdad (pronounce /tērdäd/) is a kernel module to hot-patch the Linux kernel to generate random TCP Initial Sequence Numbers for IPv4 TCP connections.

You can refer to this blog post to get familiar with the original issue:

https://bitguard.wordpress.com/?p=982

Requirements

This module has been written for x86_64 architecture and will run on a Linux kernel no older than 4.14. For the build process you will need to have the correct kernel header files already installed on your system. These header files are usually available in your apt repositories.

An example installation of the header files:

apt-get install linux-headers-`uname -r`

Usage

Compile by running:

$make

Run as root:

#insmod module/tirdad.ko

You can also disable the module with:

#rmmod module/tirdad.ko

After you disable it, kernel will continue to use its default algorithm to generate initial sequence numbers.

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Tirdad kernel module for random ISN generation

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