Re: Multicast MAC and Unicast IP Address

In article <LKGdnRrZNoWu4pTeRVn-gw@xxxxxxxxxxx>,
glen herrmannsfeldt <gah@xxxxxxxxxxxxxxxx> wrote:

> Rich Seifert wrote:
>
> > The reason for the wording of RFC1122 becomes clearer when one considers
> > that some link-layer technologies provide broadcast capability, but not
> > Ethernet-style multicast (e.g., ARCnet). The RFC simply says that
> > link-layer broadcast can be used to send IP broadcast or IP multicasts,
> > but not IP unicasts. The RFC says nothing about how one would use an
> > Ethernet-style multicast mechanism.
>
> It also nicely removes the possibility of claiming compliance for
> a device that sends every packet as a link layer broadcast.
>
> Still, I would not be surprised if some systems accept them.
>

And that would not necessarily be a Bad Thing (tm).

Seifert's Law of Networking #24:
Be conservative in what you send, and liberal in what you receive.

That is, always send your own data in conformance with the protocol
specification, but don't necessarily discard data received from others
that is not in strict syntactical compliance, if you can reasonably make
sense of the data and use it properly. "Forgive others their sins," so
to speak.


--
Rich Seifert Networks and Communications Consulting
21885 Bear Creek Way
(408) 395-5700 Los Gatos, CA 95033
(408) 228-0803 FAX

Send replies to: usenet at richseifert dot com
.

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