Globally unique multicast destination addresses have become unnecessary since the advent of SSM. If you look at the IPv4 registry, you'll what was essentially a land-grab of Group D address space back when global multicast delivery was considered "on the horizon", and ASM was the only option. Then there was GLOP for automatic assignments based on ASN, then SSM. I co-authored a draft back in ~2003 (from memory..) to deprecate global IPv6 ASM, but was over powered by vendor vote-stuffing, and it was shot down. Nearly two decades later, a similar draft emerged and is now a BCP: RFC8815
https://tools.ietf.org/html/rfc8815 No more global IPv6 group address assignments required. - Shep On Tue, Mar 2, 2021 at 1:36 PM Nicholas Warren <[email protected]> wrote: > Does IANA ( > https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xml#variable) > run the registry for IPv6 Multicast groups? “We do not make allocations > directly to ISPs or end users except in specific circumstances, such as > allocations of multicast addresses" > > > > There are only 112 registered multicast addresses? That seems low. > > > > Are some IPv6 multicast packets globally routable? Wikipedia says both yes > and no. > > Should we be allowing packets with multicast addresses in/out of our > network? >
