"I have no idea what I'm doing ...", sound familiar? With mcjoin you can verify IPv4 multicast connectivity without having to know what you're doing.
2.405 Apr 2019 10:05
Support for SSM (S,G) join, in addition to the existing ASM (*,G) join.
Find interface bsaed on default route with best metric.
Initial support for IPv6 (*,G) and (S,G) joins.
2.208 Sep 2016 07:45
Progress bar on receiver.
Bind receiver to group:port, instead of 0.0.0.0:port, filters noise.
Increased send rate of sender: 1/1 sec -- 1/100 msec.
Set outbound interface for sending multicast.
Portability, now builds and runs on musl libc.
Verify max length of interface name from operator.
2.109 Mar 2016 22:11
This release adds some more checks to make sure, but v2.0 is the real deal. It adds send+receive and automates much of your work.