Mastering Linux Network Administration
Jay LaCroix
Iptables Tutorial 1.2.2
Oskar Andreasson
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert
Practical Digital Forensics
Richard Boddington
Practical Python Security
Dennis Byrne
Securing DevOps
Julien Vehent