02-01-2019 05:28 AM
Hi All
I would like to know how all the main video providers such as Netflix, bbc etc stream there videos these days both on demand and live streams.
Would the live streams use multicast or something else ?
cheers
02-01-2019 05:41 AM
02-01-2019 05:54 AM
Hi Joseph
What about live video streams such as sports channels etc?
02-01-2019 06:30 AM
02-01-2019 07:57 AM
Hi
I am still not quite clear on the live stream to pc bit, are you saying that they would use multicast from a nearby server? so would by home broadband router just use a default route, then my ISP uses PIM to reach these servers? or would my broadband router be using PIM?
I am still a little unclear on this
cheers
02-01-2019 08:16 AM
02-01-2019 08:28 AM
Let me break down the points.
Multicast traffic needs a protocol like PIM or IGMP which ISP's cannot use in the public network because PIM cannot scale well.
The Netflix and other traffic are Unicast because you are only only person who is watching avenger movie example.
Main point is :: whenever a host needs multicast traffic it has to inform the router to send any multicast he receive via the host connected interface for this host keeps on sending a hello kind of packet once in a while, now think what if millions of pc started sending these kind of packets to the internet router.
02-01-2019 07:48 AM
Thats an awesome question and I would be glad to answer.
Actually the Netflix, youtube, etc comes under unicast traffic not even multicast or broadcast, the reason behind that is these are on-demand services and you can buy the service and watch whatever. For example if you are watching any ABC movie you should receive the movie contents in unicast not broadcast or multicast as only you are watching ABC movie at a given instant of time not everyone and routing multicast traffic over the internet is very tough.
For multicast or broadcast, you can think of a radio station or a football match live streaming.
Normally multicast needs a protocol and PIM is the protocol which most of us use. The ISP's normally filters PIM and IGMP also PIM is not designed to work in such a large scale ISP networks too.
If you found my answers to be useful please do not hesitate to click the star button...
Thanks,
Vishnu Vardhan CCNA CCNP JNCIA JNCIS JNCIP
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