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

Note: This RFC has been updated by RFC 4301, RFC 6040, RFC 8311

Errata ID: 2307
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Nikolai Malykh
Date Reported: 2010-06-21
Verifier Name: Lars Eggert
Date Verified: 2010-06-29

Section 6.1 says:

   This proposal specifies two new flags in the Reserved field of the
   TCP header.  The TCP mechanism for negotiating ECN-Capability uses
   the ECN-Echo (ECE) flag in the TCP header.  Bit 9 in the Reserved
   field of the TCP header is designated as the ECN-Echo flag.  The
   location of the 6-bit Reserved field in the TCP header is shown in
   Figure 4 of RFC 793 [RFC793] (and is reproduced below for
   completeness).  This specification of the ECN Field leaves the
   Reserved field as a 4-bit field using bits 4-7.

It should say:

   This proposal specifies two new flags in the Reserved field of the
   TCP header.  The TCP mechanism for negotiating ECN-Capability uses
   the ECN-Echo (ECE) flag in the TCP header.  Bit 9 in the Reserved
   field of the TCP header is designated as the ECN-Echo flag.  The
   location of the 6-bit Reserved field in the TCP header is shown in
   Figure 3 of RFC 793 [RFC793] (and is reproduced below for
   completeness).  This specification of the ECN Field leaves the
   Reserved field as a 4-bit field using bits 4-7.

Notes:

Incorrect reference to Figure 4 of RFC 793

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