[erlang-questions] igmp v3 and join source specific multicast

[Sergej Jurečko]

Why do you use raw instead of multicast options in gen_udp:open ?


Regards,
Sergej

> On 19 Aug 2019, at 04:30, Mark Geib <mark.geib.44@REDACTED> wrote:
> 
> Using the code below I am able to join a source specific multicast
> group and receive the datagrams from the specified source. However,
> when I open a second socket and join a second group,  i.e. different
> multicast address, I start to see the datagrams from both groups on
> both sockets. Any ideas would be greatly appreciated.
> 
> Bin = << GroupIp/binary, LocalIp/binary, SourceIp/binary >>,
> 
> {ok, Socket} = gen_udp:open(Port,
>                            [inet,
>                             binary,
>                             {active,true},
>                             {reuseaddr,true},
>                             {recbuf, RecBuf},
>                             {buffer, Buffer},
>                             {read_packets, ReadPackets},
>                             {raw, 0, 39, Bin}]),
> 
> Thanks,
> Mark.
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