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Hi @RizzyDizzy,
Welcome to TPG Community!
If your Netgear router is compatible with the NBN HFC technology.
Then you need to make sure that the configuration is correct.
Here are some community links in which customers were able to use their own router to work with the NBN HFC.
Check the discussion on Alternate router to use on HFC and Netgear D7000 Settings.
Kind regards,
BasilDV