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

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http://www.multicasttech.com/mt/
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