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iptables Command - Firewall Management
The iptables command is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. It is commonly used to configure firewall rules for network traffic control and security.
Syntax
iptables [options] [chain] [rule-specifications]
Examples
iptables -L
List all current firewall rules.
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
Allow incoming SSH connections on port 22.
iptables -A INPUT -p tcp --dport 80 -j DROP
Block incoming HTTP traffic on port 80.
iptables -D INPUT -p tcp --dport 22 -j ACCEPT
Delete the rule that allows SSH on port 22.
Notes
- Root privileges are required to modify firewall rules with
iptables. - Changes made with
iptablesare not persistent after reboot unless saved. - On modern systems,
nftablesis recommended as a replacement foriptables.
