IPv4 Unicast, Multicast and Broadcast Transmissions - CCENT Training

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This quick mini-lecture is on the different types of transmissions or packets that an IPv4 network can send.
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Thanks for the good explanation.
May I ask you a question?
I have a streamer running on my router OS embedded. The stream is coming over the udp to the multicast address.
When I route the stream to my internal router interface (where PC is connected) VLC is successfully connecting and playing video.
But I need to stream outside and when I rout the stream to the external interface I see the multicast traffic running (with tcpdump), but my VLC on my local PC doesn't connect anymore.
My provider told me they have IGMP and PIM set and running.
Unfortunately I cant check the stream as I have no other available PC. And the VLC on the smartphone doesn't support udp routing.
What I misunderstood? What am I doing wrong?

dkoxperiakoziukov
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This is not a good quality lecture. I am disappointed as a learner. You didn't explain the differences among the transmission systems neither did you explain transmission systems themselves properly.

shashwatachowdhury