Linux Networking

The essential commands for checking your IP address, gateway, DNS, and connectivity — plus how to configure network settings on a Linux host.

How to control incoming and outgoing network traffic on a Linux host using iptables and nftables — rules, chains, policies, and practical configurations.

A methodical approach to diagnosing network problems on Linux — working layer by layer from physical connectivity to application-level issues.

How to use SSH tunnels to securely access remote services, expose local servers, set up SOCKS proxies, and hop through bastion hosts.