WSCALE options in established TCP connections

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Last updated 2017-05-04 (latest revision 2016-10-31)
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The TCP Window Scale option modifies the interpretation of packets in a flow but is transmitted only at the start of the connection. As such there is a problem for observability and fault-finding, since a packet capture by a third party may miss the start of a relevant connection. This document describes the use of TCP options to provide the scale values during a connection.


Jeremy Harris (

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