[Sis-csi] Green book thoughts

[Hugh LaMaster]

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We have been using UDP for voice-video communication for
11-12 years, and, RTP/UDP for about 10 years.  We have used
multicast RTP/UDP with unidirectional link routing over
a combination of satellite/ground links.  Since those days,
there has been widespread commercial use in a variety of ways.
RTP/UDP/IP is a very well tested protocol combination.

For file transfer, there is no obvious natural datarate,
and, since the rate-limiting built-in to TCP can't always
be used, it may be an open question how a file-transfer
application can set an optimal datarate to avoid
network congestion but make full use of the available
bandwidth.

I would argue that for an end-host with a dedicated channel
back, it isn't a burning issue, because QoS at the end-host
can prioritize traffic.  I would argue that something will
be needed to avoid excessive re-transmission in the case
where several endpoints are sharing a routing relay.
DTN could provide most of the capability needed, with the
addition of a simple rate-control on file transfer
applications.  In most cases, I think DiffServ can add
the necessary robustness to keep things from breaking
outright, but, some kind of application rate-control
on transmission will be necessary for optimization.

In any case, I see no reason why UDP shouldn't be the usual
transport.


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 Hugh LaMaster, M/S 258-5,    Mail: Hugh.LaMaster at nasa.gov /~\ ASCII
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