Gateway

PMTUD discovery and Don’t Fragment (DF) bit propagation for EDT over NetScaler Gateway

October 24, 2024

Contributed by:

C H C

From release 13.1 build 17.x, the NetScaler 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.

From release 14.1 build 34.x and later, the PMTUD rediscovery mechanism identifies the loss of packets due to changes in Path MTU of the established connection and initiates the PMTU rediscovery.

For more details, see EDT MTU discovery.

Enable the PMTUD support in NetScaler Gateway

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.

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

Enable the Path MTU rediscovery support in NetScaler Gateway

Using the CLI:

At the command prompt, type;

set ica parameter -EDTPmtudRediscovery ENABLED | DISABLED
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This option is disabled by default.

Using the GUI:

Navigate to System > Settings > Change ICA Parameters.
Select the EDT PMTUD Rediscovery checkbox.

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PMTUD discovery and Don’t Fragment (DF) bit propagation for EDT over NetScaler Gateway

October 24, 2024

Contributed by:

C H C

October 24, 2024

Contributed by:

C H C

PMTUD discovery and Don’t Fragment (DF) bit propagation for EDT over NetScaler Gateway

Enable the PMTUD support in NetScaler Gateway

Enable the Path MTU rediscovery support in NetScaler Gateway

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