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Go to the router configuration
select Network
select Internet
select Bridge mode
On most DSL Modems there should a option where you set the "encapsulation" usually the option for bridge (1483 Bridged IP LLC) mode is there. Usually amongst other options there is also "PPPoE LLC" the usual setting to connect the modem. On the latest modems the settings are usually a lot more "easy" to find.
I do not have a Billion router at hand now but if I remember correctly it should be there - somewhere. I am sure you looked...............
Hope this help.