iptables, firewalld

iptables

iptables is a Linux Firewall utility that's used to configure rules on the kernel netfilter firewall. iptables processes packets based on chains of rules, deciding whether to allow, drop, or manipulate them.

DISADVANTAGE - RELOAD CONNECTION DROP

Tables & Chains

 

Basic Commands & syntax

 

Saving & Persisting Rules 

 

 

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firewalld

 

 

firewall-cmd --get-zones

 

 

firewall-cmd --zone=dmz --list-all