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RFC 4340, "Datagram Congestion Control Protocol (DCCP)", March 2006

Source of RFC: dccp (tsv)

Errata ID: 974
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Eddie Kohler
Date Reported: 2006-07-11

Section 6.6.4 says:

[text below should be added to the end of the section]

It should say:

   FGSR and FGSS values always satisfy FGSR <= GSR and FGSS <= GSS,
   where GSR and GSS are the Greatest Sequence Numbers Received by and
   Sent from this endpoint.  These constraints MUST be enforced even
   when GSR and GSS wrap, as they might in a long connection.
   Implementations SHOULD thus check FGSR and FGSS after every packet
   received or sent, as follows.  (Wmax is the maximum allowed value for
   the Sequence Window feature; see Section 7.5.2.)

         If FGSR > GSR, then FGSR := GSR - Wmax.
         If FGSS > GSS, then FGSS := GSS - Wmax.

   Alternate implementations that correctly handle sequence number
   wrapping are also acceptable.

Notes:

One technical omission has been found concerning the FGSR and FGSS
variables used to detect reordering of feature negotiation options. We
suggest adding the above paragraph to the end of Section 6.6.4, on Page
42.

via Alfred Hoenes

from pending

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