RFC 7413

TCP Fast Open, December 2014

Canonical URL:
https://www.rfc-editor.org/rfc/rfc7413.txt
File formats:
Plain TextPDF
Status:
EXPERIMENTAL
Authors:
Y. Cheng
J. Chu
S. Radhakrishnan
A. Jain
Stream:
IETF
Source:
tcpm (tsv)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC7413

Discuss this RFC: Send questions or comments to tcpm@ietf.org

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

This document describes an experimental TCP mechanism called TCP Fast Open (TFO). TFO allows data to be carried in the SYN and SYN-ACK packets and consumed by the receiving end during the initial connection handshake, and saves up to one full round-trip time (RTT) compared to the standard TCP, which requires a three-way handshake (3WHS) to complete before data can be exchanged. However, TFO deviates from the standard TCP semantics, since the data in the SYN could be replayed to an application in some rare circumstances. Applications should not use TFO unless they can tolerate this issue, as detailed in the Applicability section.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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