Contents at a Glance
I: Packet Filtering and Basic Security Measures
1 Preliminary Concepts Underlying Packet-Filtering Firewalls
3 iptables
: The Legacy Linux Firewall Administration Program
4 nftables
: The Linux Firewall Administration Program
5 Building and Installing a Standalone Firewall
II: Advanced Issues, Multiple Firewalls, and Perimeter Networks
8 NAT—Network Address Translation
9 Debugging the Firewall Rules
III: Beyond iptables and nftables
11 Intrusion Detection and Response
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