Troubleshooting a network is fun, challenging, and interesting, especially for sysadmins. Linux comes with various tools under its belt to help you along the way, including Nmap, ping, traceroute, netstat, ns lookup, and dig. For the purpose of this article, I will stick to Nmap and will explain the steps for how to troubleshoot a network.

Source: LXer – Basic network troubleshooting in Linux with Nmap