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I have just had fixed wireless NBN installed. It came with a Saegem F@ST3864V3AC modem. It works fine.
But I have a Netgear D7000-2 AC 1900 modem from my previous ADSL connection. This modem gives better and faster wifi response throughout our home.
How do I configure this modem to use the NBN connection.
I do not use or want to use VOIP so I am happy to lose this.
Can't. You need a router with no modem in it, to connect by ethernet to the NBN one. You can also try to get another approved router