this may not help but i will give you info on what has worked in the past for me as i am not a expert on dsl itself
these are fixes i have used in past. i know you said you set it up but just checking/verifying
1) some dsl require the router to clone the mac address
2) if memory serves me right you need to use set all the ip's for the gateway, dns, etc and not have router discover
3) some dsl require username and password and if not right will not let the router work
hope this helps