In such a way, it can identify if a given response corresponds to a previous valid request. Thus, a stateful firewall keeps information to track connections. In stateful firewalls, in turn, logical forwarding is relevant. Thus, if the malicious traffic matches a forwarding rule, it is forwarded regardless of being logically valid or not. Since stateless firewalls do not keep information about the streams, connections, and their requests and responses, they are not able to deal with the scenarios described above.įor stateless firewalls, matching a forwarding or blocking rule is everything. In this case, the compromised entity sends responses to requests never done
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