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Hi @TheNashSea . You must have an Asus DSL AX82U to have been FTTN.
Have a read through this thread.
https://community.tpg.com.au/t5/Modems-and-Devices/ASUS-DSL-AX82U-can-t-connect-to-HFC/m-p/127443
FTTP and HFC use the same settings.
Note my comment about WAN type; WAN type is WAN (for FTTP; ethernet to NBN box).
Your option is whether to enable VLAN ID or not. Check the setting in the old router since it works on FTTP.
BTW, email notification from Community is not working; you need to check back here from time to time.