Preface
Welcome to the fourth edition of Linux® Firewalls. The book looks at what it takes to build a firewall using a computer running Linux. The material covered includes some basics of networking, IP, and security before jumping into iptables and nftables, the latest firewall software in Linux.
A reader of this book should be running a Linux computer, whether standalone or as a firewall or Internet gateway. The book shows how to build a firewall for a single client computer such as a desktop and also shows how to build a firewall behind which multiple computers can be hosted on a local network.
The final part of the book shows aspects of computer and network security beyond iptables and nftables. This includes intrusion detection, filesystem ...
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