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Hi @Sohail . On the TPG router that connects, check if VLAN ID is enabled.
If not, the Asus setup should be just PPPoE, username and password. Check against the TPG router.
If it is, you have to set VLAN in Asus config. You'll need to consult the manual, and maybe contact Asus support.
Are you connecting the NBN box on 1GE LAN5 port?
Thank you @david64, I will check this and see if this solution works.