Here is the situation. My brother in law wanted to get internet in his company so he thought about getting DSL. He has a neighboring business that was interested in getting internet too for their business and the guy asked my brother in law if he was willing to share the internet with him. My brother in law asked for my advice and i told him that I would be cautious about something like that because you don't know what that person might be doing with the b/w and i believe it is against terms of Service to share connections across addresses. So a month or so go by and my brother in law gets DSL from and he enjoys it very much. Time flies and a few weeks later he calls me and asks me if it is possible for someone to use your DSL line without you knowing. I asked him why he asked that and he told me that the neighboring business suddenly had internet too! and that got me thinking about the possiblity of my brother in law's DSL being hijacked. Now the possiblity is there, but i was thinking that without the DSL modem the neighbor won't be able to get into the DSL. Am I right? or is it possible for someone to steal someone elses DSL line?