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Cisco Bug: CSCvu71743 - ENH: FDM - Default TCP MSS 0 - Allow MSS Negotiation

Last Modified

Jul 03, 2020

Products (1)

  • Cisco Firepower NGFW

Known Affected Releases

6.6.0 6.7.0

Description (partial)

Symptom:
The default TCP MSS value on FTD Managed by FDM is 0, which means that it is fully allowing MSS Negotiation between both end-points of the TCP connection.
This can cause problems with some traffic when using VPN, PPPoE, ADSL, where a lower MSS might be required.

Symptoms can include:
HTTPS Sites no correctly loading, packet loss through VPN connections

Conditions:
FTD Managed by FDM
Using VPN/PPPoE/ADSL
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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