How big is Azure Load Balancer UDP idle timeout?

Question

I have UDP service in Azure Kubernetes behind a load balancer. I need to know how big the UDP idle time is. How much time do I have to send back a response?

The exact situation is that I have COAP server with observable resources. I need to know how often clients should refresh observable requests (what should be the value of MaxAge property).

Answer 1

The Azure Load Balancer has a default idle timeout of 4 minutes for both TCP and UDP connections. This means that if there is no activity on the connection for 4 minutes, the load balancer will close the connection.

You can adjust the idle timeout value for your load balancer by using the Azure portal, Azure PowerShell, or the Azure CLI. To do this, you'll need to create a load balancer rule and specify the desired idle timeout value in the rule configuration.

In your case, you'll want to set the idle timeout value to a value that is appropriate for your COAP server and the refresh rate of your observable resources. This will depend on your specific requirements and the nature of your application. You may want to experiment with different values to find the optimal setting for your needs.

It's worth noting that you should also consider the idle timeout value on the client side. If the client has a shorter idle timeout value than the load balancer, the connection may be closed by the client before the load balancer has a chance to close it. This can lead to unexpected behavior and may require additional handling in your application.

I hope this helps!