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RFC 6824, "TCP Extensions for Multipath Operation with Multiple Addresses", January 2013

Source of RFC: mptcp (tsv)

Errata ID: 4129
Status: Verified
Type: Technical

Reported By: Friedrich Haussmann
Date Reported: 2014-10-11
Verifier Name: Martin Stiemerling
Date Verified: 2016-01-12

Section B.1.1. says:

MPTCP.Checksum (flag):  This flag is set to true if at least one of
      the hosts has set the C bit in the MP_CAPABLE options exchanged
      during connection establishment, and is set to false otherwise.
      If this flag is set, the checksum must be computed in all DSS
      options.

It should say:

MPTCP.Checksum (flag):  This flag is set to true if at least one of
      the hosts has set the A bit in the MP_CAPABLE options exchanged
      during connection establishment, and is set to false otherwise.
      If this flag is set, the checksum must be computed in all DSS
      options.

Notes:

Checksum is not on bit "C", but instead on bit "A". There are no other instances of referring on bit "C" as the checksum. Bit "C" is unassigned in this version.

Other instances of bit "A" as checksum:
* Section 3.1. Connection Initiation, p. 16 f.
* Section 8. IANA Considerations, Table 3: MPTCP Handshake Algorithms, p. 56

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