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RFC 5326, "Licklider Transmission Protocol - Specification", September 2008

Source of RFC: IRTF

Errata ID: 1658
Status: Verified
Type: Technical

Reported By: Alfred Hoenes
Date Reported: 2009-01-23
Verifier Name: Stephen Farrell
Date Verified: 2009-11-10

Section 3.2.1, pg.16 says:

   If the data segment is a checkpoint, the segment MUST additionally
   include the following two serial numbers (checkpoint serial number
   and report serial number) to support efficient retransmission.  Data
   segments that are not checkpoints MUST NOT have these two fields in
|  the header and MUST continue on directly with the client service
       ^^^^^^ 
  data.

It should say:

   If the data segment is a checkpoint, the segment MUST additionally
   include the following two serial numbers (checkpoint serial number
   and report serial number) to support efficient retransmission.  Data
   segments that are not checkpoints MUST NOT have these two fields in
|  the segment content and MUST continue on directly with the client
       ^^^^^^^^^^^^^^^
   service data.

Notes:

Rationale:
Section 3.2 is about 'Segment Content' as defined in section 3
and depicted in the figure on page 10 of the RFC.
Accordingly, the subject two fields are *not* part of the segment
_header_, and the original text is misleading.

Additional concern (please 'Keep for Update'):
The subject two fields, checkpoint serial number and report serial
number, obviously are not in the restricted scope of the Client
Service ID -- they are related to corrresponding fields carried in
non-data segments which do not contain a Client Service ID field.
Therefore, with respect to layering considerations, it would have
been more reasonable to place the two subject fields in front of
the Client Service ID field, at the front of the data segment, to
get them conceptionally out of the scope of the Client Service ID
field governing the Offset, Length, and Client Service Data fields.

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