4 ms·
We should fix multicast to help make decisions like this easier. Right now each additional IP-streaming listener is an incremental cost on the broadcaster - rad
by bonaldi 11y ago
We should fix multicast to help make decisions like this easier. Right now each additional IP-streaming listener is an incremental cost on the broadcaster - radiating broadcast has a huge advantage here, which proper multicast would remove.
- sandstrom 11y agoYes, this is a good point!
- _wmd 11y agoOutside a few niches (zeroconf, IPv6 SLAAC, financial data distribution) in closed environments, I don't believe we ever reached the point of figuring out how to handle Internet-sized multicast deployment. Not sure what the state of the art here is, but IIRC multicast introduces significant extra state into every router and switch involved, and with limited ability to control who is able to transmit to a multicast group. On the radio network side, I don't think IP multicast has any specific support in e.g. LTE, so even if a mobile client could subscribe to a group its bandwidth usage over the air would be equivalent to a unicast stream. Guess this was omitted for the reasons from the previous paragraph. LTE has something called multicast but AFAIK it's totally unrelated to the IP/Ethernet concept. edit: whoa, apparently 802.11 networks handle multicast properly - stations don't generate layer 1 ACKs for reception like they handle unicast traffic. There's a ton of cool stuff you could build with this on a LAN!
- TorKlingberg 11y agoLTE does have eMBMS, but I am not sure how it works with IP multicast.