The term flat rate refers to all-inclusive connection rates that are not billed according to connection times, but instead as a flat fee for fixed periods. With flat rates, there is no longer any reason to disconnect. On the contrary: New e-mails should be delivered immediately to the PC, the home office should be continuously connected to the company network, and you want to be accessible to friends and colleagues over Internet messenger services non-stop. This means it is desirable for connections to be continuously maintained.
The keep-alive function ensures that the device re-establishes the connection whenever the remote site cuts it off.
