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This paper proposes a simple mechanism to allow trade-off between
reliability with performance and scalability in a reliable
multicast transport protocol. A reliability window is used in the
data packet header to indicate which packets are useful to recover
if lost. In addition, we describe a simple API that allows
applications to set the reliability window in a way meaningful to
the application. The usefulness of the trade-off is demonstrated
using experimental results from a test network. We expect this
mechanism to be useful for large-scale content distribution where
the content ages over time.
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