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RFC 3168, "The Addition of Explicit Congestion Notification (ECN) to IP", September 2001

Source of RFC: tsvwg (tsv)

Errata ID: 6494
Status: Rejected
Type: Technical
Publication Format(s) : TEXT

Reported By: Joe Touch
Date Reported: 2021-03-24
Rejected by: Martin Duke
Date Rejected: 2021-03-24

Section Header says:

Updates: 2474, 2401, 793 

It should say:

Updates: 2474, 2401, 793, 791


This is the first standards-track RFC to assign the two unused bits of the IP TOS byte to ECN. Granted it was suggested in RFC2481, but that was experimental and unable to update RFC791 because it would create a downref.
As several have pointed out on the list, 2474 itself updates 791, so someone following 791 through the tree of its updates will consider 3168.

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