January 2015
Intermediate to advanced
432 pages
13h 23m
English
Content preview from Linux® Firewalls: Enhancing Security with nftables and Beyond, Fourth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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3. iptables: The Legacy Linux Firewall Administration Program
Chapter 2, “Packet-Filtering Concepts,” covered the background ideas and concepts behind a packet-filtering firewall. Each built-in list of rules, sometimes called a rule chain, has its own default policy. Each rule can apply not only to an individual chain, but also to a specific network interface, message protocol type (such as TCP, UDP, or ICMP), and service port or ICMP message type number. Individual acceptance, denial, and rejection rules are defined for the INPUT chain and the OUTPUT chain, as well as for the FORWARD chain, which you’ll learn about at the end of this chapter and in Chapter 7, “Packet Forwarding.”
This chapter covers the iptables firewall administration program ...
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