@aboninski That's not a modem. This is a plain unmanaged network switch. Do you have any other device before the switch which is provided by your ISP ?

@aboninski It seems that your ISP device is in bridge mode. Do you have access to this device to check that ? What's its make and model ? If that's the case the only way to arrange your LAN is to use...

@newbie199 OK, so if you set Primary and Secondary DNS in these fields your internet connection should use these DNS for queries.

@Victorlin Yes, open these ports TCP 443, TCP 943 and UDP 1194.

@helplessuser_1 I've seen users reporting DNS queries for several domains including those you mentioned. How often are these checks depends on the FW implementation.

@K4WH If you mean the power LED, it is suggested to contact the shop retailer to see whether it is under warranty.