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Ask the Expert- SD-WAN

How to support TCP Fast Open (RFC 7413) on ASA-Firewalls?

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Question

 Hi,

how do I enable the support for TFO (RFC 7413) in Cisco Adaptive Security Appliance Software Version 9.2 ?

It seems not to work out of the box, i.e. normal connection establishment  (handshake without application data bytes) works well while TFO (syn,syn-ack with application data bytes) connection establishment is rejected.

 

Regards,

 CaB

Answer