What are common network debugging tools in Linux

Short answer

Linux provides powerful built-in tools for network debugging, including ping, traceroute, ss, tcpdump, nmap, and ip.

Key tools

• ping: Tests basic reachability with ICMP echo requests.
• traceroute / tracepath: Maps the route and latency across each hop.
• ss: Replaces netstat; inspects sockets with better speed and detail.
• ip: Modern replacement for ifconfig and route; manages interfaces, addresses, and routing.
• tcpdump: Command-line packet analyzer for capturing traffic.
• nmap: Scans ports and discovers hosts on a network.
• curl / wget: Tests HTTP/HTTPS endpoints and downloads content.
• dig / host: Queries DNS servers for detailed record information.
• mtr: Combines ping and traceroute for continuous path analysis.

When to use each

Use ip and ss for local configuration checks. Use tcpdump when you need to see the actual packets. Use mtr for intermittent latency issues. Use nmap for security audits and inventory.

Why it matters

Mastering these tools allows you to diagnose network problems without installing heavy software. They are scriptable, lightweight, and available on virtually every Linux distribution.