I just reinstalled my computer with debian jessie (debian 8, current stable version), and I can no more access to my modduo web interface. Before I was using ubuntu 12.04, it was working out of the box.
When I plug the mod, USB ethernet adapter appears in gnome , but marked as "deactivated". an lsusb returns:
Bus 004 Device 002: ID 0525:a4a2 Netchip Technology, Inc. Linux-USB Ethernet/RNDIS Gadget
I think it is just a matter of adding the right lines in /etc/network/interfaces or something like that...
If someone has already the solution, I prefer playing with my mod rather than struggling with debian config...