TCP Fast Open
In computer networking, TCP Fast Open (TFO) is an extension to speed up the opening of successive Transmission Control Protocol (TCP) connections between two endpoints.
It works by using a TFO cookie (a TCP option) in the initial SYN packet to authenticate a previously connected client. If successful, it may start sending data to the client before the receipt of the final ACK packet of the three way handshake is received, skipping a round trip and lowering the latency in the start of transmission of data. This cryptographic cookie is stored on the client side and is set upon the initial connection. It is then repeated back whenever the client reconnects.
IPv4 support for TFO was merged into the Linux kernel mainline in versions 3.6 (support for clients) and 3.7 (support for servers), and was turned on by default in version 3.13. TFO support for IPv6 servers was merged in version 3.16.
- Kerrisk, Michael (2012-08-01). "TCP Fast Open: expediting web services". LWN.net.
- Radhakrishnan S, Cheng Y, Chu J, Jain A, Raghavan B (2011-12-06). "TCP Fast Open". ACM CoNEXT.
- Cheng Y, Chu J, Radhakrishnan S, Jain A (2013-01-26). TCP Fast Open. IETF. I-D draft-ietf-tcpm-fastopen-06. https://tools.ietf.org/html/draft-ietf-tcpm-fastopen-06.
- Kerrisk, Michael (2012-08-01). "TCP Fast Open: expediting web services". LWN.net. "The client-side support has been merged for Linux 3.6"
- Vaughan-Nichols, Steven J (2012-12-11). "Linux 3.7 arrives, ARM developers rejoice". Linux and Open Source (ZDNet). "Linux 3.7. TCP Fast Open will now be supported on servers"
- 1.10. TCP Fast Open enabled by default. "Linux Kernel 3.13". kernelnewbies.org. 19 January 2014. Retrieved 11 February 2014.
- 1.4. TCP Fast Open server mode on IPv6 support. "Linux Kernel 3.16". kernelnewbies.org. 3 August 2014. Retrieved 14 September 2014.
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