RFC Errata
RFC 7413, "TCP Fast Open", December 2014
Source of RFC: tcpm (wit)
Errata ID: 8015
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Bart Overkamp
Date Reported: 2024-07-02
Held for Document Update by: Zaheduzzaman Sarker
Date Held: 2025-03-18
Section 4.2.2 says:
b. Otherwise, include the Fast Open option with the cookie of the server. Include any data up to the cached server MSS or default 536 bytes.
It should say:
b. Otherwise, include the Fast Open option with the cookie of the server. Include any data up to the cached server MSS or default: 536 bytes for IPv4 or 1220 bytes for IPv6.
Notes:
default MSS is IP protocol-version-specific.
Based on the discussion https://mailarchive.ietf.org/arch/msg/tcpm/mJC7Lz5GE8RmkJ_cJWaiRIn-sC8/, this is HFDU.