Joe;

> > > would pacbell filtering all multicast at all CPE equipemt fall into your
> > > bucket, where do you draw the line?
> 
> At IP, as Bob Braden said.
> 
> SMTP is _over_ IP.

Wrong. RFC821 says:

   SMTP is independent of the particular transmission subsystem and
   requires only a reliable ordered data stream channel.  Appendices A,
   B, C, and D describe the use of SMTP with various transport services.
   A Glossary provides the definitions of terms as used in this
   document.

> Multicast _redefines_ IP (or portions of the address space thereof); it
> could be argued that a service provider sells 'Internet' without selling
> multicast IP.

See STD1 for a list of "required" protocols.

                                                        Masataka Ohta

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