It look pppoe simply not work,
I'm on a ultra strandard case when i use a ADSL Modem as secondary WAN gateway. Unfortunally the PPPOE documentation exemple provide by Teltonika use a LAN port. (30 years of IT and never see it case).
Do that mean: ONLY LAN port can make a DHCP resquest over a PPPOE ?
Do that mean: MUST use VLAN by port for permit the native WAN port to be a LAN-PPPOE ?
The Modem setting is right, because i use it as modem from 6 years ago coupled with a OPNSense, and pppoe link.
i suppect RUTX devices have no capability to use a ADSL link as secondary WAN gateway , if someone can confirm that to me,, no big deal for me, it work like a charm with OPNSense.