[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 #2 from Gleb Smirnoff <[email protected]> ---
On Tue Jul  2 12:57:26  2024 UTC, [email protected] wrote:
> Bug 242677 was fixed in FBSD 12 but since some time it is back in FBSD 13. The
> test script fro hps can be used to prove this. As I am unsure how to reopen a
> previously closed bug, I am opening a new one with the same title.

I failed to reproduce on FreeBSD CURRENT.  I see both the "to_ex" and 
later "to_in" messages on the interface.

I'll attach test program, slightly simplified.  It doesn't do same thing
three time, also it now requires 192.168.1.55/24 alias on the interface.

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