{"id":130,"date":"2025-11-30T20:12:17","date_gmt":"2025-11-30T20:12:17","guid":{"rendered":"https:\/\/adler-tech.com\/?page_id=130"},"modified":"2026-04-13T15:09:40","modified_gmt":"2026-04-13T14:09:40","slug":"firewall-advanced-usage-iptables-nftables","status":"publish","type":"page","link":"https:\/\/adler-tech.com\/?page_id=130","title":{"rendered":"Firewall Advanced Usage: iptables \/ nftables"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p><strong>Duration:<\/strong> 3 days (7 hours per day)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<p><strong>Day 1 \u2013 Stateful Filtering, Connection Tracking &amp; NAT<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chapter 1: Stateful Packet Inspection<\/strong>\n<ul class=\"wp-block-list\">\n<li>Understanding connection tracking (<code>conntrack<\/code>)<\/li>\n\n\n\n<li>Stateful rules vs stateless rules<\/li>\n\n\n\n<li>Handling ESTABLISHED, RELATED, NEW connections<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 2: Advanced iptables Rules<\/strong>\n<ul class=\"wp-block-list\">\n<li>Custom chains for modular rule sets<\/li>\n\n\n\n<li>Using <code>mangle<\/code> table for packet modification<\/li>\n\n\n\n<li>NAT scenarios: SNAT, DNAT, Masquerading<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 3: Advanced nftables Concepts<\/strong>\n<ul class=\"wp-block-list\">\n<li>Tables, chains, hooks, and priorities<\/li>\n\n\n\n<li>Sets, maps, and concatenated keys<\/li>\n\n\n\n<li>State tracking in nftables<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Day 2 \u2013 Traffic Control, Rate Limiting &amp; Security<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chapter 4: Rate Limiting &amp; DoS Mitigation<\/strong>\n<ul class=\"wp-block-list\">\n<li>Using <code>limit<\/code> and <code>hashlimit<\/code> modules in iptables<\/li>\n\n\n\n<li>nftables equivalents: <code>limit rate<\/code>, <code>quota<\/code><\/li>\n\n\n\n<li>Dropping suspicious traffic patterns<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 5: Logging &amp; Auditing<\/strong>\n<ul class=\"wp-block-list\">\n<li>Advanced logging with <code>LOG<\/code>, <code>NFLOG<\/code>, <code>ulogd2<\/code><\/li>\n\n\n\n<li>Monitoring traffic anomalies<\/li>\n\n\n\n<li>Alerting on unusual activity<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 6: Firewall Policies for Security<\/strong>\n<ul class=\"wp-block-list\">\n<li>Default deny strategies<\/li>\n\n\n\n<li>Layered rules for DMZ, internal networks, VPN<\/li>\n\n\n\n<li>Blocking malformed packets, TCP flag attacks<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Day 3 \u2013 Complex Deployment &amp; Integration<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chapter 7: Firewall Integration with Services<\/strong>\n<ul class=\"wp-block-list\">\n<li>Combining iptables\/nftables with fail2ban<\/li>\n\n\n\n<li>Integrating with intrusion detection (Snort\/Suricata)<\/li>\n\n\n\n<li>Automating rules deployment via scripts or Ansible<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 8: Advanced NAT &amp; Port Forwarding<\/strong>\n<ul class=\"wp-block-list\">\n<li>Complex DNAT\/SNAT scenarios<\/li>\n\n\n\n<li>Transparent proxying and load balancing<\/li>\n\n\n\n<li>Multi-interface routing rules<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Chapter 9: Troubleshooting &amp; Performance Tuning<\/strong>\n<ul class=\"wp-block-list\">\n<li>Diagnosing dropped packets<\/li>\n\n\n\n<li>Debugging nftables\/iptable rulesets<\/li>\n\n\n\n<li>Optimizing rule order and sets for high-performance<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Duration: 3 days (7 hours per day) Day 1 \u2013 Stateful Filtering, Connection Tracking &amp; NAT Day 2 \u2013 Traffic Control, Rate Limiting &amp; Security Day 3 \u2013 Complex Deployment &amp; Integration<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":22,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-130","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Firewall Advanced Usage: iptables \/ nftables - ADLER-TECH<\/title>\n<meta name=\"description\" content=\"Advanced features of firewalls will make your system faster AND more secure. 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