Citrix Gateway

PMTUD discovery and DF bit propagation for EDT over Citrix Gateway

February 28, 2023

Contributed by:

H C

From release 13.1 build 17.x, the Citrix Gateway appliance supports DF bit enforcement for the EDT path maximum transmission unit discovery (PMTUD). Path MTU discovery helps in dynamically determining the maximum transmission unit (MTU) when establishing a session. The DF bit enforcement prevents EDT fragmentation that might result in performance degradation or failure to establish a session.

In earlier releases, Citrix Gateway supported EDT path MTUD but did not support DF bit enforcement.

For more details, see EDT MTU discovery.

Enable the PMTUD support by using the CLI

At the command prompt, type;

set ica parameter [-EnableSRonHAFailover ( YES | NO )] [-HDXInsightNonNSAP ( YES | NO )] [-EDTPmtudDF ( ENABLED | DISABLED )] [-EDTPmtudDFTimeout <positive_integer>] [-L7LatencyFrequency <positive_integer>]
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Example:

set ica parameter -EnableSRonHAFailover YES -EDTPmtudDF ENABLED -EDTPmtudDFTimeout 100
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Note:

From release 13.1 build 42.x and later, the EDTPmtudDF parameter is enabled, by default. Previously, this option was disabled, by default.

Enable the PMTUD support by using the GUI

Navigate to System > Settings > Change ICA Parameters.
In EDT PMTUD DF Enforce duration, enter the time-out in seconds for the PMTUD DF enforcement.

Note:

From release 13.1 build 42.x and later, the Enforce DF for EDT PMTUD option is enabled, by default. Previously, this option was disabled, by default.

PMTUD parameter on GUI

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PMTUD discovery and DF bit propagation for EDT over Citrix Gateway

February 28, 2023

Contributed by:

H C

February 28, 2023

Contributed by:

H C

PMTUD discovery and DF bit propagation for EDT over Citrix Gateway

Enable the PMTUD support by using the CLI

Enable the PMTUD support by using the GUI

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