2.1 Transport

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The Remote Desktop Protocol: Multitransport Extension operates over the RDP-UDP protocol, as defined in [MS-RDPEUDP], sections 1, 2 and 3.

Multitransport connections are bootstrapped using the Initiate Multitransport Request PDU ([MS-RDPBCGR] section 2.2.15.1), which is sent from server to client over the main RDP connection.