Thanks for responding. That's a very good question to ask.
The facts are, that the DSL -compatible setup in the router, at present, is all wrong.
So let's just reset the router back to factory settings, and you'll have nothing whatever you'll need to do, but set whatever WiFi parameters you want (SSID, encryption passphrase at least) and set a password ***** the admin setup too (to prevent the router from being 'jacked, by not leaving its admin password ***** the default state), and that's about it.
To reset the router back to factory settings (most of which are, incidentally, just fine for cable modem interfacing, luckily!) you locate the small reset button (it might be under a small hole, and is usually near the place where the power goes into the router), and hold it down for over 40 seconds, continuously.
Then release it.
Do you need instructions for logging in to the admin setup of the router (and setting the WiFi SSID and WiFi passphrase and the WiFi encryption type - which should be well above WEP 128-bit, to prevent hijacking of your router - the WEP 64-bit standard is completely useless at securing your router, by now) ? if so, just ask for the instructions and I will provide them.
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