> > I don't know. Homenet multicast is an open issue. But I don't think this > use case represents a serious problem, because as far as I can tell streaming > video is not done using multicast in practice anyway. > > Sorry, bad assumption. I just finished working on a TV streaming project for > an ISP and there is lots of multicast there. All live TV channel streams to > STBs > are multicast and this is a common setup amongst ISPs.
OTT video does not use multicast. IPTV deployments do use multicast. Those that I'm aware of require use of the provider-supplied CE router, which has an IGMP proxy (and MLD proxy if IPv6 multicast is supported) for LAN-to-WAN multicast management. Where Wi-Fi distribution of these multicast streams is supported, it is only done on a dedicated (and highly managed and somewhat proprietary) Wi-Fi network, that is distinct from the general-purpose (and not "professionally" managed) Wi-Fi network. The LAN interfaces of the provider-supplied CE router do tend to have IGMP/MLD snooping, to keep from flooding the general-purpose network interfaces with large multicast streams. There may also be a coax networking interface. If there is, this also tends to be dedicated and highly managed. Where Ethernet is used for distribution of multicast, it is done so that the provider STBs are all attached to the provider CE router via the same Ethernet port (and no other devices use that port) and there are no intervening routers. I mentioned at the last IETF that I expect some "home networks" to have managed and unmanaged segments. I don't consider the dedicated, managed segments to be part of the homenet domain. I would hope that the provider-supplied CE router would support homenet on its general purpose network interfaces. I'd be curious to learn about multicast IPTV deployments that allow users to supply their own CE routers and send multicast streams on network segments that are also used for general-purpose home networking (especially general-purpose Wi-Fi networks). BTW, the dedicated, highly-managed and somewhat proprietary Wi-Fi delivery of IPTV multicast streams has been very successful. Barbara _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
