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iptables / nftables

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iptables filters network packets. Allow a port: iptables -A INPUT -p tcp --dport 80 -j ACCEPT. Save rules with iptables-save. Install iptables-persistent to restore rules automatically at boot.

iptables Basics

# List rules
iptables -L -n -v

# Allow established connections
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow SSH
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# Drop everything else
iptables -A INPUT -j DROP

# Save rules
iptables-save > /etc/iptables/rules.v4

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iptables / nftables

iptables Basics