The Nokia Ni500 is an external ADSL Modem/Router. It is a rather bad one. If at all possible, try to stay away from these. They are prone to terrible connections, due apparently to heat problems. Sometimes (at least once) known as a "Pie Warmer". Whatever the reason, they are a rather bad ADSL router that doesn't even support pinholing of ports.
You can try to avoid heat problems by taking the case off to give it more ventilation. When I did this I found the entire thing felt hotter than an overclocked Athlon. Maybe mounting a few fans around the board would help.