For those that have this modem, supplied by Telstra in Australia, it is possible to configure OpenDNS from the admin console.
Once logged onto your modem, select the Advanced Icon.
Then select the Local Network option
On the page that opens up, there is an option to change a DNS server. If you update this from the default setting (which is your routers IP address), to one of OpenDNS's DNS servers, then your devices will get the OpenDNS setting when next they refresh their DNS settings, which should be about an hour later.
Hope this helps someone out there.
Please note, that if your modem gets an upgraded firmware sent over the wire, then you will have to redo this setting.
And this also works on the TG799 modem.
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