Reliable User Datagram Protocol

<h2 id="implementations">Implementations</h2>
<p>In order to ensure quality, it extends UDP by means of adding the following features:
</p>
<ol><li>Acknowledgment of received packets</li>
<li>Windowing and <a href="/facts/Flow_control_(data)/qcdKcLon">flow control</a></li>
<li>Retransmission of lost packets</li>
<li>Over buffering (Faster than real-time streaming)</li></ol>
<p>RUDP is not currently a formal standard, however it was described in an <a href="/facts/IETF_Internet_Draft/h13QYxXa">IETF Internet Draft</a> in 1999.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> It has not been proposed for standardization.
</p>
<h2 id="cisco-rudp">Cisco RUDP</h2>
<p><a href="/facts/Cisco/ocDgQt6T">Cisco</a> in its Signalling Link Terminals (either standalone or integrated in another gateway) uses RUDP for <a href="/facts/Backhaul_(telecommunications)/m4XufaF2">backhauling</a> of <a href="/facts/Signaling_System_7/YJ3T8VqE">SS7</a> MTP3 or <a href="/facts/ISDN/zcV99rUb">ISDN</a> signaling.
</p>
<ol><li>RUDP v0 (no checksums) is used for SS7 MTP3 backhaul.</li>
<li>RUDP v1 (with checksum) is used for ISDN PRI backhaul.</li></ol>
<p>The versions are mutually incompatible and differ slightly from the IETF draft. The structure of the Cisco Session Manager used on top of RUDP is also different.
</p>
<h2 id="microsoft-r-udp">Microsoft R-UDP</h2>
<p>Microsoft introduced another protocol which it named R-UDP and used it in its MediaRoom product (now owned by Ericsson) 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.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
</p>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Stream_Control_Transmission_Protocol/s8tmzUhz">Stream Control Transmission Protocol</a></li>
<li><a href="/facts/Datagram_Transport_Layer_Security/WxzxdITB">Datagram Transport Layer Security</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://9p.io/sources/plan9/sys/src/9/ip/rudp.c">Plan 9 implementation of RUDP</a></li>
<li><a href="https://datatracker.ietf.org/doc/html/draft-ietf-sigtran-reliable-udp-00/">https://datatracker.ietf.org/doc/html/draft-ietf-sigtran-reliable-udp-00/</a></li>
<li><a href="http://www.cisco.com/en/US/products/hw/vcallcon/ps2152/products_data_sheet09186a0080091b58.html">Cisco Signaling Link Terminal</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Reliable UDP Protocol <a href="https://datatracker.ietf.org/doc/html/draft-ietf-sigtran-reliable-udp-00/" target="_blank">https://datatracker.ietf.org/doc/html/draft-ietf-sigtran-reliable-udp-00/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Microsoft TV Test document by JDSU" (PDF). <a href="http://www.viavisolutions.com/sites/default/files/technical-library-files/mstvtest_an_tfs_tm_ae.pdf" target="_blank">http://www.viavisolutions.com/sites/default/files/technical-library-files/mstvtest_an_tfs_tm_ae.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Reliable User Datagram Protocol open-in-new

Reliable User Datagram Protocol