Comprehensive guide to MTR (My Traceroute) - understanding its functionality, underlying protocols, system calls, and network implementation details

Complete guide to setting up SSH tunneling using FRP (Fast Reverse Proxy) to access local servers through a public IP server

https://www.v2fly.org/

DNS Overview

iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall