I have a RUT955. Some devices can connect and get an IP address, some not.
I updated the firmware (through the web interface and using the boot loader) from
RUT9XX_R_00.06.07.4 | 2020.12.21
RUT9XX_R_00.06.07.7 | 2021.04.12
On Windows I get an Autoconfiguration IP Address assigned.
There is no problem receiving a lease when connected with the cable.