1.3.9 Connect-Time and Continuous Network Characteristics Detection

Connect-Time Auto-Detection occurs once during the RDP Connection Sequence (section 1.3.1.1), and is accomplished by sending request and response messages over the main RDP connection during the Optional Connect-Time Auto-Detection phase.

The following messages are encapsulated in the server-to-client Auto-Detect Request PDU (section 2.2.14.3) and flow over the main RDP connection, implementing Connect-Time Auto-Detection:

The following messages are encapsulated in the client-to-server Auto-Detect Response PDU (section 2.2.14.2) and flow over the main RDP connection as part of Connect-Time Auto-Detection:

Continuous Auto-Detection occurs on a constant basis after the RDP Connection Sequence has completed, and is implemented by sending request and response messages over the main RDP connection and any created sideband channels ([MS-RDPEMT] section 1.3.2).

The following messages are encapsulated in the server-to-client Auto-Detect Request PDU and flow over the main RDP connection, implementing Continuous Auto-Detection:

  • RTT Message Request (section 2.2.14.1.1)

  • Bandwidth Measure Start (section 2.2.14.1.2)

  • Bandwidth Measure Stop (section 2.2.14.1.4)

The following messages are encapsulated in the client-to-server Auto-Detect Response PDU and flow over the main RDP connection as part of Continuous Auto-Detection:

  • RTT Measure Response (section 2.2.14.2.1)

  • Bandwidth Measure Results (section 2.2.14.2.2)

The following messages are encapsulated in the RDP_TUNNEL_SUBHEADER ([MS-RDPEMT] section 2.2.1.1.1) structure and are used to implement Continuous Auto-Detection over the sideband channels that are in active use:

  • Bandwidth Measure Start (section 2.2.14.1.2)

  • Bandwidth Measure Stop (section 2.2.14.1.4)

  • Network Characteristics Result (section 2.2.14.1.5)

  • Bandwidth Measure Results (section 2.2.14.2.2)

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