On Monday 12 May 2003 11:02, Gianni Minetti wrote:
I'm evaluating the feasibility to use udp-cast as a reliable multicast file
transfert protocol over a satellite link in order to distribute spooled
Udpcast supports FEC (forward error correction) mode, which should
make it suitable for monodirectional (or high latency) communication.
The way it works is that for n data packets, k "error correction" are
computed, and also transmitted. The protocol can then compute all data
packets using _any_ n packets (for instance n-3 data packets and 3
error correction packets). Thus, no acknowlegments are needed.
Just start the sender with the --fec and --async options.
Do you know any application of udp-cast over satellite
For the moment, I don't know any application. At work, we use a mtftp
based protocol; the main reason for that is because this application
was already in use before udpcast existed.
Are there any statistic model that better describe the
udp-cast? What about udp-cast and the emerging pgm protocol (aka Tibco).
With FEC, you can tune udpcast for whatever reliability you need (just
increase number of redundant packets per slice, or decrease number of
data packets). If you expect packet losse to come in bursts, you may
Thanks a lot in advance for your interest and