RFC Errata
RFC 3168, "The Addition of Explicit Congestion Notification (ECN) to IP", September 2001
Source of RFC: tsvwg (tsv)See Also: RFC 3168 w/ inline errata
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