Date: Fri, 22 Nov 2019 15:51:14 +0300 From: Victor Gamov <vit@otcnet.ru> To: freebsd-net@freebsd.org Subject: IGMP on FreeBSD-12.1 Message-ID: <ab4a097b-eca9-fb8b-7925-2026a95af9be@otcnet.ru>
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Hi All
I have FreeBSD 12.1-STABLE r354850
When I started
ffmpeg -i
'udp://232.232.9.57:3344?localaddr=10.200.207.35&source=10.200.205.2'
then IGMP-Join sended out and ifmcstat reports about 232.232.9.57 on
proper interface.
I kill ffmpeg but ifmcstat still reports about 232.232.9.57 on interface.
Any following ffmpeg start does not generate IGMP-Join as I understand
because kernel think it still joined to this multicast.
Then I start this scenario on FreeBSD 11.3-STABLE #1 r354778 then group
subscription immediately removed from interface at the moment when
ffmpeg killed.
More things. When I request multicast on 11.3 from 12.1 then 11.3
respond to General-query like this:
=====
10.200.207.42 > 224.0.0.22: igmp v3 report, 1 group record(s) [gaddr
232.232.99.7 is_in { 10.200.208.33 }]
=====
When I request multicast on 12.1 from 11.3 then 12.1 respond to
General-query like this:
=====
10.200.207.35 > 224.0.0.22: igmp v3 report, 1 group record(s) [gaddr
232.232.9.44 to_ex { }]
=====
And when ffmpeg started on 12.1 first time as following
ffmpeg -i
'udp://@232.232.9.44:3344?localaddr=10.200.207.35&source=10.200.205.2'
then 12.1 generates IGMP-Join without source:
=====
10.200.207.35 > 224.0.0.22: igmp v3 report, 1 group record(s) [gaddr
232.232.9.44 to_ex { }]
=====
So, I assume 12.1 have some problem with IGMP
--
CU,
Victor Gamov
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