G'day, I just bought this router and got it running successfully as a straight forwar router, connected via lan to my pc and via lan to my modem ? router tto internet.

My issue is, I can't seem to get it running on NBN.  The IPTV/VLAN option opens a drop down menu and nbn is there.  When I select it I lose internet.

I've always used Asus or Netgear routers which are so much easier to setup, but I am having trouble with this one.

Any help appreciated please to connect to nbn and get best possible performance