torrents work while communicating through logical "PORTS"...since many of the people are using P2P too much ... ISP providers are blocking the routers(they want to save more money) thruouh which the client connects to internet..dont know about which routers exactly....but If u are a Airtel Subscriber..go for WEB DISTRIBUTOR 1. This is a USB device with complete compatibilty for any* internet application.
Btw i too have the same modem & 256 kbps connection & P2P wares ROCK!!!!