Reliable User Datagram Protocol
- Reliable User Datagram Protocol
In computer networking, the Reliable User Datagram Protocol (RUDP) is a transport layer protocol designed at Bell Labs for the Plan 9 operating system. It aims to provide a solution where UDP is too primitive because guaranteed-order packet delivery is desirable, but TCP adds too much complexity/overhead.
It extends UDP by adding the following additional features:
# Acknowledgment of received packets
# Windowing and congestion control
# Retransmission of lost packets
# Overbuffering (Faster than real-time streaming)
RUDP is not currently a formal standard, however it was described in an IETF [http://www3.ietf.org/proceedings/99mar/I-D/draft-ietf-sigtran-reliable-udp-00.txt internet-draft] in 1999. It has not been proposed for standardization.
Microsoft R-UDP
Microsoft has introduced another protocol they refer to as R-UDP. It is used in their MediaRoom product for IPTV service delivery over multicast networks. This is a proprietary protocol and very little is known about its operation. It is not thought to be based on the above referenced IETF draft.
References
* RFC 908 (Version 1)
* RFC 1151 (Version 2)
* [http://plan9.bell-labs.com/sources/plan9/sys/src/9/ip/rudp.c Plan 9 implementation of RUDP]
* http://www3.ietf.org/proceedings/99mar/I-D/draft-ietf-sigtran-reliable-udp-00.txt
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2010.
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