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RFC 1323, "TCP Extensions for High Performance", May 1992

Note: This RFC has been obsoleted by RFC 7323

Source of RFC: tcplw (tsv)

Errata ID: 4346
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT

Reported By: Niels Laukens
Date Reported: 2015-04-24
Held for Document Update by: Martin Stiemerling
Date Held: 2015-10-01

Section 2.3 says:

      Since the max window is 2**S (where S is the scaling shift count)
      times at most 2**16 - 1 (the maximum unscaled window), the maximum
      window is guaranteed to be < 2*30 if S <= 14.  Thus, the shift
      count must be limited to 14 (which allows windows of 2**30 = 1
      Gbyte).  If a Window Scale option is received with a shift.cnt
      value exceeding 14, the TCP should log the error but use 14
      instead of the specified value.

It should say:

      Since the max window is 2**S (where S is the scaling shift count)
      times at most 2**16 - 1 (the maximum unscaled window), the maximum
      window is guaranteed to be < 2**30 if S <= 14.  Thus, the shift
      count must be limited to 14 (which allows windows of 2**30 = 1
      Gbyte).  If a Window Scale option is received with a shift.cnt
      value exceeding 14, the TCP should log the error but use 14
      instead of the specified value.

Notes:

Typo in the 3rd line: the window should be less than 2 to the power of 30, instead of 2 multiplied by 30.

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