Australian ISP Internode does not officially support OpenWRT.
I recently connected HFC (hybrid fibre coaxial) with NBN & Internode. To get it working I needed to tag VLAN 2 on the WAN interface. Using the Luci web interface, navigate to Networks -> Switch and set the dropdown to
Tagged next to VLAN 2 under
WAN. Then setup the WAN interface like a standard PPPoE with
<username>@internode.on.net for the username and my account password.