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Multipath TCP (MPTCP), standardized in RFC8684 [1], is a TCP extension that enables a TCP connection to use different paths. Multipath TCP has been used for several use cases. On smartphones, MPTCP enables seamless handovers between cellular and Wi-Fi networks while preserving established connections. This use-case is what pushed Apple to use MPTCP since 2013 in multiple applications [2]. On dual-stack hosts, Multipath TCP enables the TCP connection to automatically use the best performing path, either IPv4 or IPv6. If one path fails, MPTCP automatically uses the other path. To benefit from MPTCP, both the client and the server have to support it. Multipath TCP is a backward-compatible TCP extension that is enabled by default on recent Linux distributions (Debian, Ubuntu, Redhat, ...). Multipath TCP is included in the Linux kernel since version 5.6 [3]. To use it on Linux, an application must explicitly enable it when creating the socket. No need to change anything else in the application. This attached patch adds an --mptcp option which allows the creation of an MPTCP socket instead of TCP on Linux. If Multipath TCP is not supported on the system, an error will be reported. It is important to note that if the end server doesn't support MPTCP, the connection will continue after a seamless fallback to TCP. Link: https://www.rfc-editor.org/rfc/rfc8684.html [1] Link: https://www.tessares.net/apples-mptcp-story-so-far/ [2] Link: https://www.mptcp.dev [3] Co-developed-by: Dorian Craps (@CrapsDorian) <doriancraps@gmail.com> Co-developed-by: Olivier Bonaventure (@obonaventure) <Olivier.Bonaventure@uclouvain.be> Co-developed-by: Matthieu Baerts (@matttbe) <matttbe@kernel.org> Signed-off-by: Dorian Craps <dorian.craps@student.vinci.be> Closes #13278 |
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Packages
This directory and all its subdirectories are for special package information, templates, scripts and docs. The files herein should be of use for those of you who want to package curl in a binary or source format for these platforms.