[Bug 280086] multicast: setsockopt(...IP_DROP_MEMBERSHIP...) doesn't lead to sending IGMP packet after base r349369

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 dropping mebership: Add membership 11:31:24.963

Re: OpenVPN suddenly working one way only

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]