Stateful and Stateless AWS Traffic Handling (2024)

FAQs

What is stateless and stateful in AWS? ›

In a stateful system, data from one session is carried over to the next. A stateless system doesn't preserve data between sessions and depends on external entities such as databases or cache to manage state. Stateful and stateless architectures are both widely adopted.

Stateful firewalls keep track of the state or context of connections by maintaining a state table. This allows them to differentiate between legitimate packets belonging to established connections and potentially malicious or unauthorized packets. Stateless firewalls do not track the state of connections.

Network Firewall rule groups are either stateless or stateful. Stateless rule groups evaluate packets in isolation, while stateful rule groups evaluate them in the context of their traffic flow.

What types of firewall rules are supported? AWS Network Firewall supports both stateless and stateful rules.

Stateful applications retain data between sessions, but stateless applications don't. For example, stateful applications remember products in a user's cart after logging out, while stateless applications treat every login as a new session and cart information is lost.

The key difference between stateful and stateless is whether an application retains information about the current state of a user's interactions or if it treats each request as an independent, isolated transaction.

They simply render their UI based on the properties that are passed to them. This makes stateless widgets more efficient than stateful widgets. In general, you should use stateless widgets whenever possible. This will improve the performance of your app and make it easier to maintain.

Stateful components manage the application's state and behavior, while stateless components handle the rendering of UI elements based on that state. In this example, CounterApp is a stateful component that manages the count state.

HTTP and HTTPS both are stateless protocols. The S in HTTPS stands for Secure and it refers to use of ordinary HTTP over an encrypted SSL/TLS connection.

Network ACLs are stateless: This means any changes applied to an incoming rule will not be applied to the outgoing rule. If you allow an incoming port 22, you would also need to apply the rule for outgoing traffic.

What is the difference between stateful and stateless configuration? ›

The stateless approach is used when a site is not concerned with the exact addresses that hosts use. However, the addresses must be unique. The addresses must also be properly routable. The stateful approach is used when a site requires more precise control over exact address assignments.

AWS Network Firewall is a stateful, managed, network firewall and intrusion detection and prevention service for your virtual private cloud (VPC) that you create in Amazon Virtual Private Cloud (Amazon VPC). With Network Firewall, you can filter traffic at the perimeter of your VPC.

AWS API Gateway supports stateless (e.g., HTTP, REST) and stateful (e.g., WebSocket) APIs. The service provides powerful authentication with AWS IAM policies, user pools from Amazon Cognito, and Lambda functions like authorizers.

Stateless firewalls do not store any information about packets or connections, and they apply the same rules to every packet, regardless of its context or history. Stateless firewalls are faster and simpler than stateful firewalls, but they are also less flexible and secure.

Amazon VPC supports the creation of an Internet gateway. This gateway enables Amazon EC2 instances in the VPC to directly access the Internet. You can also use an Egress-only internet gateway which is a stateful gateway to provide egress only access for IPv6 traffic from the VPC to the Internet.

A stateless system sends a request to the server and relays the response (or the state) back without storing any information. On the other hand, stateful systems expect a response, track information, and resend the request if no response is received.

The stateless approach is used when a site is not concerned with the exact addresses that hosts use. However, the addresses must be unique. The addresses must also be properly routable. The stateful approach is used when a site requires more precise control over exact address assignments.

A system is stateless when it doesn't need to store any data within itself. Website and web app frontends are usually stateless, for example. On the other hand, applications such as databases are said to be stateful. They require persistent storage that outlives the lifecycle of individual container replicas.