Citrix Virtual Apps and Desktops

Enlightened Data Transport

March 21, 2025

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Enlightened Data Transport (EDT) is a Citrix-proprietary transport protocol built on top of User Datagram Protocol (UDP). It delivers a superior user experience on challenging long-haul connections while maintaining server scalability. EDT improves data throughput for all ICA virtual channels on unreliable networks, providing a better and more consistent user experience.

When Adaptive Transport is enabled, EDT is the preferred protocol.

Things to know

Session Reliability must be enabled to use MTU Discovery and EDT with NetScaler Gateway and Citrix Gateway Service.
Packet fragmentation can cause performance degradation or even failure to open sessions in some cases. To prevent this, you must adjust the EDT MTU to a value adequate for your networks. You can use EDT MTU Discovery or a manual workaround described in How to configure MSS when using EDT on networks with non-standard MTU.
For details on enabling the use of EDT with NetScaler Gateway, see Configure NetScaler Gateway to support Enlightened Data Transport.

EDT MTU Discovery

MTU Discovery allows EDT to automatically determine the Maximum Transmission Unit (MTU) when establishing a session. Doing so prevents EDT packet fragmentation that might result in performance degradation or failure to establish a session.

MTU Discovery is enabled by default. If you need to disable it, see HDX features managed through the registry for details.

In scenarios where dynamic routing through asymmetrical paths may cause the MTU for the session to change, MTU Discovery can also detect and adjust the session’s MTU accordingly. Rediscovery is disabled by default. To enable it, see HDX features managed through the registry.

Note:

Session Reliability must be enabled for MTU Discovery to work.

MTU Discovery with Multi-Stream ICA is available with VDA versions 2209 and later.

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Enlightened Data Transport

March 21, 2025

Contributed by:

March 21, 2025

Contributed by:

Enlightened Data Transport

Things to know

EDT MTU Discovery

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