Re: IPv6 Multicast Routing&Registry

[Greg Shepherd <gjshep () gmail com>]

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 <nwarren () barryelectric com>
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?