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04 SCTP for Beginners SCTP Data Transmission.pdf

04 SCTP for Beginners SCTP Data Transmission.pdf

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the SSTHRESH to be cut down drastically, and reset the CWND (wherea timeout causes a new Slow Start with CWND=MTU, and a FastRetransmit sets CWND=SSTHRESH).Path MTU DiscoverySince the Path MTU is such an important variable (influencing thecongestion control), an <strong>SCTP</strong> implemetations should keep a variable <strong>for</strong>the estimate of the current Maximum <strong>Transmission</strong> Unit (Path MTU) <strong>for</strong>each path. How this is done, is closer described in RFC 1191 - Path MTUDiscovery and RFC 1981 - Path MTU Discovery <strong>for</strong> IP Version 6.

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