This article defines the Methods that can be used for performing Stateful Filtering.
Using Reflexive/Dynamic Access Control List
Reflexive ACL provides the ability to filter traffic at session layer. It is used to allow IP traffic for session originated from within the network and to deny traffic for sessions originated from outside of the network.
Reflexive access list can only be defined with extended named IP Access Lists. It cannot be defined with numbered or standard named IP access lists or any other protocol access list
Reflexive ACL inspects TCP control flags (ACK, SYN, RST etc.), inspects source and destination IP address, inspects source and destination ports and it creates temporary ACLs (ACEs) for inside originating session.
Configuration
first we will define an ACL that will define the traffic which is being inspected
then we will block all the incoming traffic from outside to inside with an exception of inspected traffic
Using CBAC (Context Base Access Control)
Using Zone Base Firewall
Using ASA (Adaptive Security Appliance)
Using Reflexive/Dynamic Access Control List
Reflexive ACL provides the ability to filter traffic at session layer. It is used to allow IP traffic for session originated from within the network and to deny traffic for sessions originated from outside of the network.
Reflexive access list can only be defined with extended named IP Access Lists. It cannot be defined with numbered or standard named IP access lists or any other protocol access list
Reflexive ACL inspects TCP control flags (ACK, SYN, RST etc.), inspects source and destination IP address, inspects source and destination ports and it creates temporary ACLs (ACEs) for inside originating session.
Configuration
first we will define an ACL that will define the traffic which is being inspected
then we will block all the incoming traffic from outside to inside with an exception of inspected traffic
Using CBAC (Context Base Access Control)
Using Zone Base Firewall
Using ASA (Adaptive Security Appliance)
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