This document has been reviewed as part of the transport area review team's
ongoing effort to review key IETF documents. These comments were written
primarily for the transport area directors, but are copied to the document's
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The document is well written, I only have the following two nits:

* 2.1.5. Guidelines for Configuring TCP Keep-Alives
  It seems that the item list at the end of the subsection provides
  information related to "idle-time", "max-probes", and "probe-interval".
  One item for one leaf, in the given order.
  What confuses me is that the first item contains:
  "but keep-alive messages SHOULD NOT be transmitted more frequently than
  once every 15 seconds"
  For me, this applies to not only to "idle-time" but also to "probe-interval".
  However, for "probe-interval" you provide lower values.
  Using
  "A lower value MAY be configured, but idle intervals SHOULD NOT be smaller
  than 15 seconds. Longer idle intervals SHOULD be used when possible."
  would have avoided this confusion.

* Acknowledgements
  The authors would like to thank for following for lively discussions
  should possibly read
  The authors would like to thank the following for lively discussions

Best regards
Michael Tüxen