👨🚀Stateless vs Stateful 🧑💻firewalls 🚀 i.e NACL vs Security Group
Stateless firewalls:
Does not track or monitor the state of network connections.
Each packet is considered independently without any context of the connection it belongs to.
Faster as it does not have to maintain connection state tables.
Prone to spoofing attacks.
However, it is less secure as it cannot detect anomalies in connection like sequence numbers.
Stateful firewalls:
Tracks and monitors the state of network connections and packets.
Maintains a state table to track active connections traveling across it.
More intelligent as it can detect anomalies by comparing packets to connection state.
Only allows traffic that has been previously requested or established.
More secure than stateless as it can detect anomalies like spoofing, sequence number anomalies etc.
But susceptible to man-in-the-middle attack
However, it is slower than stateless as maintaining state tables requires more processing.
In summary:
Stateless firewalls are faster but less secure as they do not track connection states.
Stateful firewalls are more secure as they can detect anomalies but are slower due to additional processing of maintaining connection states.
Most modern enterprise firewalls are stateful as the extra security and protection outweighs the minor decrease in speed compared to stateless firewalls. Stateful firewalls provide overall better security for networks.