In Part Three of our firewall series, we’re drilling down into some of the mechanisms used in firewalls, namely the progression from stateless to stateful packet filtering. First, packet filtering is the action of inspecting the traffic traversing the firewall’s network to determine if the traffic is meeting the firewall’s security policy. Traffic conforming to the firewall’s security policy is allowed to proceed, while traffic not meeting the policy (e.g. a malicious attempt) is blocked.

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