IDLE timeout and Keepalive Interval

The Keep-Alive is in sec. The main reason that the keep-Alive is a setting is the LTM as a full Proxy does not pass client Keep-alives to the server. You have to create a customer TCP profile for this. Also you do not want the LTM to send Keep-Alives to most connections. As Connection eat memory it is best for the LTM to create and remove connections when it can. Keep-Alives are best for long term connection to Databases server and such where the application expects the connection to always be open and will have unexpected results if it is not.