Want to share this as it took me some time to work out how to connect my ASUS RT-AC68U to the TPG NBN. There seems to be plenty of help on the dsl version of this router but not for the above. You basically need to set the VLAN setting to 2 but this setting on the modem is in the most hidden location that one would not be able to find. Under Advanced Settings > click on LAN > click on IPTV tab > under LAN Port select Manual Settings from the list of ISP's > set Internet VID to 2 and PRIO to 0. Assuming you have already setup your username and password and other obvious setting when the above is appied it worked. Hope you find this usefu!!!
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