RFC Errata
RFC 2516, "A Method for Transmitting PPP Over Ethernet (PPPoE)", February 1999
Source of RFC: LegacyArea Assignment: int
Errata ID: 5635
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Chris Fletcher
Date Reported: 2019-02-11
Held for Document Update by: Eric Vyncke
Date Held: 2021-01-28
Section Appendix A says:
If there is data, and the first octet of the data is nonzero, then it MUST be a printable UTF-8 string which explains the nature of the error. This string MAY NOT be NULL terminated.
It should say:
If there is data, and the first octet of the data is nonzero, then it MUST be a printable UTF-8 string which explains the nature of the error. This string MUST NOT be NULL terminated.
Notes:
Keyword "MAY NOT" should be "MUST NOT" to comply with RFC 2119.
-- Verifier note --
The use of "MAY NOT" is not covered by RFC 2219 but the text is nevertheless clear. See point 2 of https://www.ietf.org/about/groups/iesg/statements/processing-rfc-errata/