How to make tcp have establish option's function or reflexive in ASA like icmp have echo reply
how to make tcp have establish option's function or reflexive in ASA like icmp have echo reply
rather than permit tcp in both side
An ASA firewall is stateful.
The reflexive access for TCP connections (or UDP flows) is allowed by default as the firewall checks for established connections prior to applying an access-list on traffic that arrives at an interface.
Excerpted from this document (emphasis mine):
"Here are the individual steps in detail:
Packet is reached at the ingress interface.
Once the packet reaches the internal buffer of the interface, the input counter of the interface is incremented by one.
Cisco ASA will first verify if this is an existing connection by looking at its internal connection table details. If the packet flow matches an existing connection, then the access-control list (ACL) check is bypassed, and the packet is moved forward.
If packet flow does not match an existing connection, then TCP state is verified. If it is a SYN packet or UDP packet, then the connection counter is incremented by one and the packet is sent for an ACL check. If it is not a SYN packet, the packet is dropped and the event is logged."
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