There is a computer that has access to the Internet both via the local network and by a GSM modem. As far as I know, when both connections are active, the modem connection is the primary one and all data is transmitted by the modem.

Because of the fact that the slow modem connection is supposed to be used as a backup connection, I want Windows to use it only when the connection via LAN is unavailable. At the same time I want the GSM modem connection to be active constantly.

Is it possible to make Windows not use modem connection when there is a working LAN Internet connection?

Thanks for your help in advance,

Mariusz.