Security

Blocking Specific Websites with Linux Routing Tables

Want to allow Google but block Facebook on a Linux system — without installing any firewall software? You can do it by manipulating the routing table. This guide covers the networking fundamentals (IP addresses, netmasks, CIDR, gateways) and then walks through the practical setup on RHEL 8. What you'll learn * IP addresses, IPv4 vs IPv6, and how they work * Netmasks and CIDR notation * What a gateway is and how routing tables work * Blocking specific websites by manipulating routes