I had the same problem for awhile. I think the problem was that I've set my static ip (in my home subnetwork) as the first ip (router ip: 79.112.5.1, my ip: 79.112.5.2). After I changed it to 79.112.5.5 (actually I made some other changes (setting them back as they were when I bought the router).. but I don't think they had anything to do with this) it started to work. From what I know the first and the last ip are reserved for broadcasting and another thing... Hope this will work well for u too, otherwise I'll post the other settings as well.
