🚀 Systemd Network Security Deep Dive! 🛡️ Limit & Protect Your Linux Services! Welcome back to the systemd series! In this video, we're diving deep into systemd's powerful network control features. Learn how to secure your Linux services by limiting network access and protecting them from unauthorized connections. We'll cover: * **IP Accounting:** Track network traffic usage at the service level. * **IP Address Allow/Deny (Incoming & Outgoing):** Control which IP addresses can connect to and from your services. * **Systemd Drop-ins:** Customize service configurations without modifying original files. * **eBPF Filtering:** Understand how systemd filters network traffic at the kernel level. * **Socket Bind Controls:** Restrict which ports and protocols your services can bind to. * **NFTables Integration:** Use systemd to dynamically manage nftables sets for advanced traffic shaping. * **Systemd Version Considerations:** Ensure your systemd version supports the features covered. Whether you're a system administrator, developer, or Linux enthusiast, this tutorial will equip you with the knowledge to enhance the security and control of your network services using systemd. 🔥 Key Takeaways: * Learn to use systemd to manage network access without relying solely on firewalls. * Discover how to implement fine-grained control over IP addresses and ports. * See how systemd integrates with nftables for advanced traffic control. 👍 If you found this video helpful, please give it a thumbs up, share it with your fellow Linux enthusiasts, and subscribe for more in-depth Linux tutorials! 💬 Leave a comment below if you have any questions or suggestions for future videos. I'd love to hear from you! 🔗 Related Videos: More info: man #systemd #linux #networksecurity #nftables #ebpf #linuxsecurity #systemadministration #tutorial #servers Timestamps: 00:00 Introduction 00:41 IP Accounting 02:23 IP Address Allow/Deny (Incoming) 06:14 IP Address Allow/Deny (Outgoing) 08:33 Systemd Drop-ins 11:02 eBPF Filtering 12:18 Socket Bind Controls 14:11 NFTables Integration 17:59 Systemd Version Considerations Code - Service: [Service] NFTSet=cgroup:inet:filter:iperf3 Code - NFTables: flush ruleset table inet filter { set iperf3 { type cgroupsv2 } chain input { type filter hook input priority filter; policy accept; socket cgroupv2 level 2 @iperf3 limit rate over 100 mbytes/second drop } chain output { type filter hook output priority filter; policy accept; socket cgroupv2 level 2 @iperf3 limit rate over 100 mbytes/second drop } }