Basic Concepts
Four tables and five chains; The filter table is responsible for filtering; INPUT chain processing inbound; OUTPUT outbound.
Common Operations
Open port 80: iptables - A INPUT - p TCP - dport 80- j Accept. Ban IP: - s malicious IP - j DROP.
Save rules
Restarting the iptables rule will result in loss. Save with iptables save and load automatically upon startup.
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