[dtn-interest] TCPCL

["Velt, R. (Ronald) in 't" <[e-mail]>]

Hi,

The Delay Tolerant Networking TCP Convergence Layer Protocol I-D (draft-irtf-dtnrg-tcp-clayer-09) has been with the RFC Editor for a while and is now in AUTH48 state. It may, therefore, be a tad late for comments, even if they are fairly minor ones. But perhaps not entirely too late. Maybe some of the perceived flaws mentioned below can, if confirmed, still be repaired.

 - Page 3, 2nd paragraph: "Bundling Protocol" should be "Bundle Protocol"

- Page 5, item "Connection Parameters":  "Section Section 4.2" should be "Section 4.2" (Probably already detected and dealt with by the RFC Editor)

- Page 8, Figure 2, left-side part of the figure, under node A:
* 1st DATA_SEGMENT: "Bundle Data 0..L1" should be "Bundle Data 0..(L1 - 1)"
* 2nd DATA_SEGMENT: "Bundle Data L1..L2" should be "Bundle Data L1..(L1 + L2 - 1)"
* 3rd DATA_SEGMENT: "Bundle Data L2..L3" should be "Bundle Data (L1 + L2)..(L1 + L2 + L3 - 1)"

- Page 11, Section 4.2: The fourth paragraph of this section and following indented part discusses the effect of Contact Header Flags on parameter negotiation, but makes no mention of the LENGTH flag. The reader is kept in the dark w.r.t. the interpretation of this flag until section 5.5. For the sake of completeness, it could be stated that there is no parameter negotiation associated with the sending of LENGTH messages.

- Page 14, 2nd paragraph, last sentence: Is this really stating that if a node is able to receive a segment of arbitrary size, then it MUST be able to receive segments of any size up to and including the bundle size? Or is the intended meaning that if a node is able to receive a segment of a certain size, it MUST be able to receive smaller segments as well? (In which case the "<= X" at the end of the sentence should be "<= Y").  (Not sure about this one!!)

- Page 17,second paragraph under Figure 7, last sentence: "The receiver MUST be prepared for this ..." should be "The sender MUST be prepared for this ..." (I.e., the _sender_  of the LENGTH message and subsequent DATA_SEGMENT message, when _receiving_ a BUNDLE_REFUSE message).

- Page 17, section 5.6, third paragraph:  "(as described in Table2, ..." => closing parenthesis missing. (Probably already detected and dealt with by the RFC Editor)

- Throughout the document: a quantity of 8 bits is alternatingly referred to as "byte" or "octet". It would be better to pick one or the other and use the chosen term consistently.

Thanks,
Ronald in 't Velt





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