Depends on what your ISP is. Some it is a limitation of the physical hardware (such is the case for most satellite systems, as they transmit via bursts, for example). Also, I will say to be cautious with the matter. Many ISPs take a no nonsense policy on such things, and will gladly cut your service if you break their TOS. The best solution is to contact your ISP, explain the situation, and deal with it from there.