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1 year agoIs this your modem? https://help.iinet.net.au/how-setup-tg-789-broadband-gateway-nbn-fttbn
Can you access http://10.1.1.1 and log in as described? If so can you take a screenshot over that web site after you log in so we can see what settings are available to tweak? There might be a chance your modem-router will do just fine.
I found the manual Can you get on that web site using a laptop?
Can you log in, click on Internet, and take a screenshot (from a laptop)? Make sure to remove your public ip address form the screenshot. In your case it means remove ip addresses that does not start with 192.168.xxx.xxx