[ih] IPv8...

[Craig Partridge]

On Tue, Apr 21, 2026 at 8:58 AM John Day via Internet-history <
internet-history at elists.isoc.org> wrote:

> Let me try to provide some other definitions of multicast and anycast that
> will either help or confuse things.
>
> First the definition of multicast in the Internet is patterned after
> multicast in Ethernet. That definition assumes that all stations see all
> packets, which implies flooding. This is what happens in Ethernet so it is
> quite natural and works well. However, it isn’t so useful for general
> networks, where one would like to avoid flooding. Perhaps a better more
> abstract definition would be:
> (I hesitate to call it a multicast *address* even though it is taken from
> the IP address space because an address is location-dependent and
> route-independent. That doesn’t really apply to multicast in general.)
>

You clearly don't understand Deering's contribution to multicast.  He took
the semantics of Ethernet multicast and generalized it to an Internet such
that "all stations see all packets" but rather only those stations and
links willing to receive/carry the multicast address (or, if you wish, a
group of multicast addresses of which the target multicast address is one)
see the packet.

This simplification also applies to anycast in an Internet context.

Craig

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