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I have just updated to NBN from ADSL2+.
The blue LAN light on the NBN box keeps flashing continuosly.
The rest of the lights remain on and do not flash.
Have you connected the NBN box to the WAN port of the wifi router using an ethernet cable?
On the wifi router, is the Internet light on or off?
Yes NBN box is connected to WAN port of the wifi router using an ethernet cable
Internet light is on on the wifi router
I may have read that the DSL light flashes when transferring data, but not sure if regular on, off or flickering.
If you disconnect ethernet and wifi devices, the DSL light should just stay on; it indicates a connection to the router.