Using ss, iftop, tcpdump, and others for network issues

In this recipe, we're going to list a few tools that can be used for isolating and debugging network issues, most of which can be found in the default repositories of common distributions.

A lot of these, if not all, where covered before in this book, but it's a good idea to repeat these tools over and over again, because 20% of what you'll find yourself doing in a troubleshooting scenario is trying to remember which tool is good for troubleshooting this particular problem.

Getting ready

In this recipe, feel free to try out some or all of the commands listed (or even go off script and have a read of the relevant man pages). We will be using the CentOS VM...