Hello!At first, try to monitor ICMP route from B to A using traceroute when you have and don't have problem.Maybe in case of problem traffic goes throught some router which blocks packets due to doss protections\overloading. Also, you can send UDP ping from B to A usingnping --udp -g [source_port]
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280086
--- Comment #4 from gu...@gvr.org ---
I tested the test program on my system (13.3-RELEASE-p3) (tcpdump in backgroud
while the test programs runs). As you can se there is no IGMP traffic after
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