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KB44155 - After launching Pulse Desktop Client 9.0R3 and above, end users machines may experience slow performance and connectivity issues due to MTU size is set to 576 Bytes.

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Last Modified Date5/8/2019 4:32 PM
This article describes an issue where the maximum transmit unit (MTU) size is set to 576 bytes instead of 1400 bytes for the virtual adapter.
Problem or Goal
After launching the tunnel with Pulse Desktop Client 9.0R3 and above, the MTU size for the virtual adapter is set to 576 bytes which will cause slow performance issue and connectivity issue based on the application requirement.
This issue occurs due to the supportability of path MTU (PMTU) in Pulse Desktop Client 9.0R3 and above.  Based on RFC guidelines, if the TCP MSS is blank, the MTU size will b e set to 576 bytes.
To identify the problem, run the following command:

netsh interface ipv4 show subinterface

Example output:

   MTU  MediaSenseState   Bytes In  Bytes Out  Interface
------  ---------------  ---------  ---------  -------------
4294967295                1          0      14450  Loopback Pseudo-Interface 1
  1500                1   24002936    1020139  Ethernet
  576                 1       6388       6606  Local Area Connection* 10
  1500                1          0     210552  Npcap Loopback Adapter

In the following example, Local Area Connection* 10 is the name of the virtual adapter.  The interface name can be confirmed using the IPCONFIG /ALL command:

Ethernet adapter Local Area Connection* 10:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Juniper Networks Virtual Adapter
   Physical Address. . . . . . . . . : 02-05-85-7F-EB-80

To disable the PMTU feature, perform the following steps:
  1. Login to administrator web interface
  2. Navigate to  System > Configuration > Advanced client configuration
  3. Enter the following XML input:

Once the above option is set, the client will use MTU of 1400 Bytes. 
Related Links
Attachment 1 
Created ByPraveen Gopikrishnan



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