SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys
Michael W Lucas
Building Secure and Reliable Systems
Heather Adkins & Betsy Beyer & Paul Blankinship & Piotr Lewandowski & Ana Oprea & Adam Stubblefield
Hacking - The art of exploitation
Jon Erickson
Wireshark Fundamentals
Vinit Jain
Burp Suite Cookbook
Sunny Wear
Mastering Linux Network Administration
Jay LaCroix
The Complete Metasploit Guide
Sagar Rahalkar
Offensive Shellcode from Scratch
Rishalin Pillay
Mastering Linux Administration
Alexandru Calcatinge & Julian Balog