GL-X3000 as a Modem (bridge)

Routers
1

Hello,

I have a GL-X3000 and I'd like to configure it to be a passive modem and pass the cellular connection to my existing router via the ethernet connection.

Could you please let me know how I can configure this?

Thanks!

2

The x3000 connects to the Internet through the modem
Existing router via x3000?

3

In a previous setup I used the 2nd router as an AP and disable wifi on the spitz. Limits router features but not an issue for my use case.

4

May I confirm if you require the feature is 'passthrough' aka 'modem bridge' to avoid the mutil-layer NAT? Bring the modem IP to the Ethernet port of the lower devices directly?