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Cisco Bug: CSCul47395 - ASA should allow out-of-order traffic through normalizer for ScanSafe

Last Modified

Apr 16, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.0(3) 9.1(3)

Description (partial)

Symptom:
When faced with minimal packet loss, the ASA using the ScanSafe connector feature may cause significant performance delay while trying to buffer traffic and Normalize the flow. This is a feature change request to allow a user to configure the normalizer such that out-of-order packets will be allowed through and buffered/processed by the client TCP stack and not the intermediary stack enforced by the ASA TCP Normailzer functionality.

Conditions:
This is seen when using the ScanSafe feature on the ASA (9.0 and later) and there is some, even a little, packet loss between the ScanSafe tower and the ASA Connector.
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