All things related to multicast

[Marshall Eubanks <>]

Ross Finlayson wrote:

> At 09:09 AM 6/7/02, Gould, Aaron M (NRSW N60R11) wrote:
>
> > UMTP (udp mcast tunneling protocol); Ross thanks.  I just look that up on
> > google.com.  I was wondering if something like this existed.  It seems 
> > like
> > a protocol that takes the place of IGMP.  Does it?
>
>
> No!  UMTP <http://www.live.com/umtp.txt> is definitely *not* intended to 
> 'replace' IGMP, or real multicast routing protocol(s).  It is simply an 
> application-level hack that can be used to tunnel UDP multicast packets 
> over a non-multicast-routed cloud, by tunneling them in UDP unicast packets.
>
> In an ideal world, hacks like UMTP would never be needed, as all routers 
> would support multicast routing.  As this is an "Internet2" mailing 
> list, I assume that most people on this list do, indeed live in (or at 
> least, are working towards living in) such an 'ideal world' :-)
>
> > would umtp solve me inability to join a mcast group on the MBone through a
> > local internet cloud that doesn't run mcast routing protocols?
>
>
> Yes, but your best solution would be to fix your "local internet cloud 
> that doesn't run mcast routing protocols".  But anyway, to use UMTP, you 
> will need to have access to (e.g., a user account on) a host (preferably 
> one that's topologically near you) that's *already* on the MBone.  On 
> this host, you would run a UMTP 'slave' such as "liveGate" 
> <http://www.live.com/>.


And to do that, you will generally have to pay extra. We, for example, 
will provide tunnel bandwidth, but not for free.

Regards
Marshall


> Then, on a host on your local network (e.g., your desktop machine), you 
> would run  UMTP 'master' software, with a tunnel to the other host.  One 
> possible UMTP master to run is "multikit" 
> <http://www.live.com/multikit/>, which is a SDP/SAP browser (somewhat 
> similar to "sdr") with optional UMTP tunneling built in.  Another 
> possible UMTP master is "liveGate for Intranets", which can be found 
> (for the next week or so) at <http://www.live.com/lgfi4203/>.
>
>         Ross.


--
                                 Regards
                                 Marshall Eubanks

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T.M. Eubanks
Multicast Technologies, Inc
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