![]() Stateful Firewall configuration: # Generic rule to allow clients to connect to anyĪllow traffic related to connections initiated by any internal client back to the same clientĭeny any other traffic coming in to the client Let’s see what configuration of the stateful and stateless firewall are needed to make this communication work. ![]() Let’s take a scenario to understand this betterĪ client sitting behind firewall connects to a web server and receives a reply. If a packet belongs to an already running flow it can be allowed, while a new connection form the untrusted host can be dropped. A stateful firewall can detect these states. A TCP connection for example goes through the handshake (SYN-SYN+ACK-ACK), to EASTABLISHED state, and finally is CLOSED. A firewall can be stateful or statelessĪ stateful firewall is capable of tracking connection states, it is better equipped to allow or deny traffic based on such knowledge. Firewalls provide traffic filtering and protects the trusted environment for the untrusted.
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