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Iptables on Ubuntu 24.04

by bCloud LLC

Version 1.8.10+ Free with Support on Ubuntu24.04

iptables Firewall

iptables is a powerful command-line firewall and packet filtering framework for Linux systems. It allows administrators to define rules for controlling network traffic based on IP addresses, ports, protocols, and connection states, providing fine-grained control over system security.

Features of iptables:

  • Implements stateful packet filtering for inbound, outbound, and forwarded traffic.
  • Supports Network Address Translation (NAT) for port forwarding and masquerading.
  • Enables IP-based access control using chains, tables, and rules.
  • Provides protection against unauthorized access and network-based attacks.
  • Fully CLI-driven and scriptable for automation and infrastructure-as-code workflows.
  • Works seamlessly on IP-based environments without requiring domains or databases.

iptables Usage

$ sudo su
$ iptables --version        # Check iptables version
$ iptables -L -n -v         # List active firewall rules
$ iptables -A INPUT -p tcp --dport 22 -j ACCEPT  # Allow SSH traffic
$ iptables -A INPUT -j DROP # Drop all other inbound traffic

Disclaimer: iptables is an open-source Linux firewall framework maintained by the Linux Netfilter community. It is provided "as is" without any warranty. Users are responsible for configuring firewall rules correctly to avoid service disruption, ensure system security, and comply with organizational and regulatory requirements.