Dnsthingy is router based thus no router no Internet. All the other suppliers is application based that can be bypassed on the device itself. It is also in the firmware of the router thus it cannot be removed.
Do you need a separate adsl modem?
Give me a shout, will assist setting up 30 day free for you to test. Will even try and supply the router for the testing purpose.
How much is the router and what is the specs?