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https://www.tldp.org/HOWTO/Multicast-HOWTO-1.html
Unicast is anything that is not broadcast nor multicast. All right, the definition is not very bright... When you send a packet and there is only one sender process -yours- and one recipient process (the one you are sending the packet to), then this is unicast. TCP is, by its own nature, unicast oriented.
https://www.quora.com/Why-cant-TCP-be-used-for-multicast-or-broadcast-while-UDP-can
Also mechanisms like congestion detection, together with the famous “slow start” belongs to TCP. If you start planning this into a multicast is already a nightmare. You would need to establish an agent on top of TCP that runs separate connections with each receiver. And then, what do you do, if one of the connections fails or is congested?
https://support.google.com/googlenest/thread/199247?hl=en
Why does google wifi not support multicast data (iptv). Telus optik tv relies on this. 2 Recommended Answers 13 Replies 50 Upvotes. I’m trying to replace my Telus router with google wifi. I can’t do this as Telus Optik TV needs a router that can handle multicast data. ... This is also not a link-local multicast issue. It's a multicast ...
https://community.cisco.com/t5/routing/tcp-udp-and-multicast/td-p/451895
Re: TCP, UDP and Multicast. You can't use TCP over Mcast since TCP is session based. As you stated UDP is the protocol of choice for Mcast applications. Other non session based protocol such as IGMP, OSPF, EIGRP, RIP also use Mcast for message delivery.
https://blog.pythian.com/network-multicast-support-azure/
The output clearly tells us that we don’t have multicast support for either for 230.0.1.0 or 224.0.0.251 multicast addresses. What does the Virtual Network FAQ for Azure tell us about it? Here is the answer: Do VNets support multicast or broadcast? No. We do not support multicast or broadcast. What protocols can I use within VNets?
https://stackoverflow.com/questions/21266008/can-i-use-broadcast-or-multicast-for-tcp
No, you can't. TCP is a protocol for communication between exactly two endpoints. Compared to UDP it features reliable transport, that means, that packets get not only send, but it is expected that the peer acknowledges the receipt of the data and that data will be retransmitted if the acknowledgement is …
https://community.cisco.com/t5/routing/ospf-and-icmp-not-use-transport-protocol/td-p/2028681
Now, TCP does not support multicast and UDP is not reliable Therefore, OSPF implements its own transport mechanism that allows both for reliability (acknowledgements and retransmissions of lost segments) and multicasting, bypassing both TCP and UDP. ICMP does not use any specific transport protocol because it basically does not need any.
https://en.wikipedia.org/wiki/Multicast
Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with physical layer point-to-multipoint communication. Group communication may either be application layer multicast or network assisted multicast, where the latter makes it possible for the source to efficiently send to the group in a single transmission.
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