Linux iptables Pocket Reference
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Wireshark Fundamentals
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Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert
GitHub For Dummies
Sarah Guthals & Phil Haack
The Cybersecurity Self-Help Guide
ARUN. SONI