3 articles
Move beyond simple open/close rules. Master 'nftables', the modern Linux firewall engine. Learn to write 'Rich Rules' for rate limiting, IP blocking, and logging. Understand the logic of Chains, Sets, and Tables.
How does a hundred servers talk to the internet using just one IP address? Master the mechanics of Network Address Translation (NAT) and Masquerading. Learn to turn a Linux box into a router for your home or office.
Protect your server from the outside world. Master the basic of Linux firewalls. Learn the simple 'Uncomplicated Firewall' (UFW) for Ubuntu and the powerful 'Firewalld' for enterprise systems. Understand the philosophy of Default Deny.