RFC 6038, "Two-Way Active Measurement Protocol (TWAMP) Reflect Octets and Symmetrical Size Features", October 2010

Errata ID: 6410
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Nikolai Malykh
Date Reported: 2021-01-25
Verifier Name: Martin Duke
Date Verified: 2021-01-26

Section 5.2.1 says:

   Section 4.2.1 of [RFC5357] recommends a padding truncation process
   for use in TWAMP.  When using that process in conjunction with the
   Reflect Octets mode, the Session-Reflector MUST reflect the
   designated octets from the Session-Sender's test packet in the Packet
   Padding (from Session-Sender) field, and MAY re-use additional Packet
   Padding from the Session-Sender.  The Session-Reflector MUST truncate
   the padding such that the highest number octets are discarded, and
   the test packet length equals the Session-Sender's packet length.
   When using the recommended truncation process, the Session-Reflector
   MUST truncate exactly 27 octets of padding in Unauthenticated mode,
   and exactly 56 octets in Authenticated and Encrypted modes.

It should say:

   Section 4.2.1 of [RFC5357] recommends a padding truncation process
   for use in TWAMP.  When using that process in conjunction with the
   Reflect Octets mode, the Session-Reflector MUST reflect the
   designated octets from the Session-Sender's test packet in the Packet
   Padding (from Session-Sender) field, and MAY re-use additional Packet
   Padding from the Session-Sender.  The Session-Reflector MUST truncate
   the padding such that the highest number octets are discarded, and
   the test packet length equals the Session-Sender's packet length.
   When using the recommended truncation process, the Session-Reflector
   MUST truncate exactly 27 octets of padding in Unauthenticated mode,
   and exactly 64 octets in Authenticated and Encrypted modes.

Notes:

Invalid required padding size (56 instead of 64) for modes with authentication and encryption.

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