Explore advanced open-source tools for monitoring bandwidth usage and troubleshooting network interface issues on Linux and Unix systems. Learn about Nethogs for tracking application-specific bandwidth consumption, Speedometer for real-time network traffic visualization, and ipTraf for detailed network statistics. Discover how to effectively use these powerful utilities to gain deeper insights into your system's network performance, identify potential bottlenecks, and optimize your bandwidth usage. Build upon previous knowledge of bandwidth monitoring techniques and expand your toolkit for comprehensive network analysis.