Describe the feature

AWS Network Load Balancer now supports configurable TCP idle timeout.

Announcement: https://aws.amazon.com/about-aws/whats-new/2024/09/aws-network-load-balancer-tcp-idle-timeout/

Use Case

To set idle timeout for NLB.

Proposed Solution

It is likely that it cannot be set at present, and we need to wait for CloudFormation support.
It is necessary to set tcp.idle_timeout.seconds in the listener's Attributes.

aws elbv2 modify-listener-attributes \
          --listener-arn arn:aws:elasticloadbalancing:us-east-1:000011112222:listener/network/NLBTest/123/123 \
          --attributes \
              Key=tcp.idle_timeout.seconds,Value=600 

https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-nlb-tcp-configurable-idle-timeout/

However, there is no way to configure it using CloudFormation.
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-elasticloadbalancingv2-listener.html

I also tried adding it to the load balancer's attributes, like with ALB, but I couldn't do it.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

all

Environment details (OS name and version, etc.)

all