Reliable User Datagram Protocol

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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:

  1. Acknowledgment of received packets
  2. Windowing and congestion control
  3. Retransmission of lost packets
  4. Overbuffering (Faster than real-time streaming)

RUDP is not currently a formal standard, however it was described in an IETF internet-draft in 1999. It has not been proposed for standardization.

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