HowTo: using mping for (fun and) profit
Ever since I started working with multicast back in the early 2000's, I've had to make my own tools. There weren't that many useful ones available, at least not in the Open Source space where I worked.
The first tool made, mcjoin,
was based on an example an IBM'er had made public. I used that, the
ping(1) tool, and
tcpdump(1), to check my multicast flows.