Citrix virtual desktop tcp/udp transmission protocol switching

Preface

Adaptive transmission yes Citrix Virtual Apps and Desktops One of the mechanisms , It provides access to Enlightened Data Transport (EDT) As ICA Functions of the connected Transport Protocol . When EDT Is not available , Adaptive transmission will switch to TCP.

EDT It is based on User Datagram Protocol (UDP) Built Citrix Proprietary Transport Protocol . It maintains server scalability while , It provides an excellent user experience in challenging long-distance connections .EDT Improves all of the... In unreliable networks ICA Data throughput of virtual channel , So as to provide better 、 A more consistent user experience .

System requirements

The following is using adaptive transmission and EDT The requirements of ：

• Control plane

• Citrix DaaS（ Formerly known as Citrix Virtual Apps and Desktops service ）
• Citrix Virtual Apps and Desktops 1912 Or later

• Virtual Delivery Agent

• edition 1912 Or later （ recommend 2103 Or later ）
• edition 2012 Yes, it will EDT And Citrix Gateway The minimum requirements for the combined use of services

• StoreFront

• edition 3.12.x
• edition 1912.0.x

• Citrix Workspace Applications

• Windows： edition 1912 Or later （ recommend 2105 Or later ）
• Linux： edition 1912 Or later （ recommend 2109 Or later ）
• Mac： edition 1912 Or later （ recommend 2108 Or later ）
• iOS：Apple App Store The latest version provided in
• Android：Google Play The latest version provided in

• Citrix Gateway (ADC)

• 13.0.52.24 Or later
• 12.1.56.22 Or later

• A firewall （ from VDA From the perspective of ）

• UDP 1494 Inbound - If session reliability is disabled
• UDP 2598 Inbound - If session reliability is enabled
• UDP 443 Inbound - If ICA encryption (DTL) To enable the VDA SSL

Chapter one Intranet access policy settings

1、 stay DDC Console Use Citrix In strategy  HDX Adaptive transmission settings configure the following options .

• ​ The preferred . This is the default setting . Adaptive transmission is enabled , It USES EDT As the preferred transmission protocol , And back to TCP.
• Diagnostic mode . Adaptive transmission is enabled , And force the use of EDT. Fallback to... Is disabled TCP. This setting is only recommended for testing and troubleshooting .
• Turn off . Adaptive transmission disabled , Only TCP For transmission .​

2、 So far, access to the cloud desktop through the intranet is switched to UDP Transmission protocol takes precedence .

• To confirm EDT Whether it is being used as the transmission protocol of the session , Can be in VDA Upper use Director or CtxSession.exe Command line utility .

​ matters needing attention

When adaptive transmission is set as preferred ,EDT Will be used as the main transport protocol ,TCP Will be used for fallback . By default , Adaptive transmission settings are preferred . Adaptive transmission can be set to diagnostic mode for testing , This is only allowed EDT And disable fallback to TCP.

Chapter two Public network access policy settings

1、 stay DDC The console uses Citrix Session reliability connection in policy .

• ​ Enable session reliability to use EDT MTU Discover and will EDT And Citrix Gateway and Citrix Gateway Services are used together .
• Make sure it is fully set EDT MTU To avoid fragmentation . otherwise , In some cases , Performance may be affected or the session may not start .​

2、netscaler in Citrix Gateway-Virtual Servers edit Basic Settings Set up , Enable DTLS.

• Citrix Virtual Apps and Desktops Support for components based on TCP The connection uses transport layer security (TLS) agreement .Citrix Virtual Apps and Desktops You can also use adaptive transmission , Support for UDP Of ICA/HDX Connection uses datagram transport layer security (DTLS) agreement .

3、 A firewall NAT Mapping release UDP port .

4、 thus Citrix The adaptive transmission protocol public network access adjustment is completed . EDT In use , The transport protocol will display one of the following ：

• UDP > ICA（ Session reliability is disabled ）
• UDP > CGP > ICA（ Session reliability is enabled ）
• UDP > DTL > CGP > ICA（ICA yes DTL Encrypted end-to-end ）