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Cisco Bug: CSCvt21946 - ENH: Reduce Time Taken for the AnyConnect MTU Discovery Process

Last Modified

Jun 18, 2020

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases


Description (partial)

After the AnyConnect virtual adapter is activated, it derives a candidate tunnel MTU from the physical MTU. It then undergoes an MTU Discovery Process to determine if the value needs to be lowered to accommodate the path. This process can add a considerable amount of time to the initial VPN establishment. 

This is an enhancement request to reduce the amount of time necessary for this phase of the connection.

Relevant when a device in the middle of the path has an MTU lower than the physical MTU of the client and headend.
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