I have a working 6yr old example with EM7455. Not using OpenWrt though.
Extremely interested in this! Can you provide some details?
Yes, I'm going to stick with it for the time being.
But on a long term basis, it would be interesting to know whether I could prepare myself to dive into some complex rabbit hole replicating somehow what the Zyxel does on Openwrt or not at all. And on that regard, I'm still confused by what @bmork added : if there's an ip passthrough mode on the EG18 which is not exposed through AT commands, it sounds a bit unsure I will be able to do anything
Let me see if I can find that dump and I'll PM you.
IP passthrough on the EG18 is there, but it is not enough.
The EG18 is connected to the USB3 host controller in a Mediatek MT7621 SoC. The LAN port of the LTE7490-M904 is port 2 of a MT7530 switch connected by RGMII to the MT7621. OpenWrt is running on the MT7621 and controlling both the USB3 controller and the switch. It will route between these interfaces. The easiest and best way to implement IP passthrough is like Zyxel does it: Using two-way default routing between the two interfaces, with the necessary application overlay to advertise the IP address on the LAN interface and implement necessary layer 2 functions like ARP and ND.
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