Citrix Gateway

PMTUD discovery and DF bit propagation for EDT over Citrix Gateway

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.

To 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>]
<!--NeedCopy-->

Example

set ica parameter -EnableSRonHAFailover YES -EDTPmtudDF DISABLED -EDTPmtudDFTimeout 100
<!--NeedCopy-->

Note: The EDTPmtudDF parameter is disabled, by default.

To enable the PMTUD support by using the GUI

  1. Navigate to System > Settings > Change ICA Parameters.

  2. Select Enforce DF for EDT PMTUD.

  3. In EDT PMTUD DF Enforce duration, enter the time-out in seconds for the PMTUD DF enforcement.

PMTUD parameter on GUI

PMTUD discovery and DF bit propagation for EDT over Citrix Gateway