Hello RFC editor,
Attached is an erratum for RFC 4342. Thanks very much for
including
this on the erratum page.
Eddie Kohler & Sally Floyd
RFC 4342, "Profile for Datagram Congestion Control
Protocol (DCCP)
Congestion Control ID 3: TCP-Friendly Rate Control
(TFRC)"
Reported By: Sally Floyd and Eddie Kohler, from Gerrit
Renker
Date: 17 December 2006
Section 5, 7th paragraph:
Explanation: Clarification of round-trip time measurement
It states:
The sender's measurement of the round-trip time uses the
Elapsed Time
and/or Timestamp Echo option contained in feedback
packets, as
described in Section 8.2. The Elapsed Time option is
required, while
the Timestamp Echo option is not. The sender maintains
an average
round-trip time heavily weighted on the most recent
measurements.
It should say:
The sender uses DCCP's mechanisms to measure round-trip
times. This
includes Elapsed Time and/or Timestamp Echo options, and
as described
in Section 8.2, feedback packets MUST carry Elapsed Time
options.
Senders MAY additionally make use of other available RTT
measurements, including those from the initial
Request-Response
packet exchange. This differs from [RFC3448], which
constrains RTT
measurement to feedback packets only. For CCID 3
calculations, the
sender uses an average round-trip time heavily weighted
on the most
recent measurements.
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