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[RFC7413]. It also includes a pre-shared key mode of operation in which the server requires the client to be in possession of a shared secret in order to successfully open TFO connections with that server. The names of some existing fastopen sysctls have changed (e.g., net.inet.tcp.fastopen.enabled -> net.inet.tcp.fastopen.server_enable). Reviewed by: tuexen MFC after: 1 month Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D14047