Firewall

R3zk0n · October 2, 2025

Network
Contents
    • A firewall can be placed on routers or hosts (software based) or can be its own device.
      • It blocks packets from entering or leaving the network:
        • Via stateless inspection:
          • The firewall will examine every packet against a set of rules.
          • Once the packet matches a rule, the rule is enforced, and the specified action is taken
        • Via stateful inspection:
          • The firewall will only examine the state of the connection between networks
          • Specifically, when a connection is made from an internal network to an external network, the firewall will not examine any packets returning from the external connection.
          • As a general rule, external connections are not allowed to be initiated with the internal network.
      • It is the first line of defense in protecting the internal network from outside threats

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