2.2.1.3.8 Client Multitransport Channel Data (TS_UD_CS_MULTITRANSPORT)
The TS_UD_CS_MULTITRANSPORT packet is used to indicate support for the RDP Multitransport Layer ([MS-RDPEMT] section 1.3) and to specify multitransport characteristics. This packet is an Extended Client Data Block and MUST NOT be sent to a server which does not advertise support for Extended Client Data Blocks by using the EXTENDED_CLIENT_DATA_SUPPORTED flag (0x00000001) as described in section 2.2.1.2.1.
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header (4 bytes): A GCC user data block header, as specified in User Data Header (section 2.2.1.3.1). The User Data Header type field MUST be set to CS_MULTITRANSPORT (0xC00A).
flags (4 bytes): A 32-bit, unsigned integer that specifies protocols supported by the client-side multitransport layer.
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Value
Meaning
TRANSPORTTYPE_UDPFECR
0x01
RDP-UDP Forward Error Correction (FEC) reliable transport ([MS-RDPEUDP] sections 1 to 3).
TRANSPORTTYPE_UDPFECL
0x04
RDP-UDP FEC lossy transport ([MS-RDPEUDP] sections 1 to 3).
TRANSPORTTYPE_UDP_PREFERRED
0x100
Indicates that tunneling of static virtual channel traffic over UDP is supported ([MS-RDPEDYC] section 3.1.5.4).
SOFTSYNC_TCP_TO_UDP
0x200
Indicates that switching dynamic virtual channels from the TCP to UDP transport is supported ([MS-RDPEDYC] section 3.1.5.3).