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Re: [AVT] RTCP unicast feedback for measurement applications?

Hello;

I see no reason why you could not use unicast RTCP for measurement applications

- we do this already with our prototype unicast RTCP
- the NLANR multicast beacon uses unicast reports (although not rtcp, alas) to
respond back to the beacon server, which is how

http://beaconserver.accessgrid.org:9999/

gets generated.

On Monday, February 3, 2003, at 05:23 AM, Fiandra Riccardo wrote:

Gents,
I was interested in the "RTCP Extensions for Single-Source Multicast
Sessions with Unicast Feedback" draft.
Actually, I was wondering if it is also targeted to have a very large and
distribuited network measurement framework.
Where multicast receivers (thousands) use RTCP to send report to a
measurement collector about packet loss, jitter, or other.
I see really many advantages on that for e2e measurements, especially in a
scenario where thousands of receivers are always connected to the network
and cannot send multicast (common scenario for an operator, even without
SSM...).

My questions are:
-Was this a scenario of application when writing the draft?
It was in my mind when reviewing it. In any case, Internet protocols are not restricted
to uses thought of in advance !

-In this case, could I use the RTCP channel multicasted to the receivers to
control them?
Why not ?


-Do you see any extension possible also for ptp rtp connections (forward
rtcp reports to another device?)
The danger here is denial of service attacks (if you are sending 50 mbps of reports to somewhere,
and I can re-direct this to point somewhere else, we have a big DOS problem).

Tanx in advance for any feedback

Riccardo


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Audio/Video Transport Working Group
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                                 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 : tme@multicasttech.com
http://www.multicasttech.com

Test your network for multicast :
http://www.multicasttech.com/mt/
 Status of Multicast on the Web  :
 http://www.multicasttech.com/status/index.html

_______________________________________________
Audio/Video Transport Working Group
avt@ietf.org
https://www1.ietf.org/mailman/listinfo/avt