Dave Thaler wrote:
> > -----Original Message-----
> > From: Marshall Eubanks [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, September 17, 2001 3:40 PM
> > To: Thomas Narten
> > Cc: Dave Thaler; Erik Nordmark; [EMAIL PROTECTED];
> > [EMAIL PROTECTED]
> > Subject: Re: uni-based-mcast and malloc-ipv6-guide
> >
> > Thomas Narten wrote:
> >
> > > > How so? One can renew multicast addresses. (Conceivably an
> > > > implementation could support the ability to automatically renew
> > > > multicast addresses as long as the unicast address stays valid.)
> > >
> > > Suppose I want to get a multicast address so I can advertise a
> session
> > > (e.g., on a web page). I do this two weeks in advance of the event.
> I
> > > want the address to last one day only. The key point is that I will
> > > want to use the address staring two weeks from now.
> > >
> > > However, because unicast lifetimes are only a week, that's too far
> > > into the future to actually get the address (yet), so the address
> > > can't be obtained yet. This would seem like it might be a problem.
> Is
> > > it? (I don't know how this scenario fits with the way multicast is
> > > actually used in IPv4, so this really is a question.)
> > >
> > > Thomas
> >
> > In IPv4 I would say, use a GLOP address for this. (We'll rent you one
> if
> > you don't have any.)
>
> GLOP has exactly the same issue for end sites that don't own
> their own AS #.
>
> When you renumber, chances are it's because you changed your provider,
> in which case you can no longer use your old provider's GLOP space.
>
> Uni-based mcast addresses don't require end sites to have their
> own AS # (or any other non-aggregatable number).
>
> -Dave
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Hi Dave;
Yes, but he asked "the way multicast is actually used in IPv4".
That's the answer to the question he asked, maybe not to others he
should have asked.
--
Regards
Marshall Eubanks
T.M. Eubanks
Multicast Technologies, Inc
10301 Democracy Lane, Suite 410
Fairfax, Virginia 22030
Phone : 703-293-9624 Fax : 703-293-9609
e-mail : [EMAIL PROTECTED]
http://www.on-the-i.com
Test your network for multicast : http://www.multicasttech.com/mt/
Check the status of multicast in real time :
http://www.multicasttech.com/status/index.html
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