If you type <adsl router> into the search box on the left hand of this thread it will bring up a page giving 47 links, which, hopefully, may indicate your problem. I use NTL cable broadband router, not adsl, so not familiar with that setup.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This 2D animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.