Its quite frustrating when you are trying to download some stuff from a torrent or a p2p connection but your connection keeps on breaking down. Another scenario could be your VOIP call getting dropped up. You might try to blame your software or computer setting for that but the real culprit could be your ISP.

Keeping this in mind a la Comcast the electronic frontier foundation (EFF) has released Switzerland an open source Network testing tool.

SWITZERLAND indicates the data lost or modified between clients. It identifies the effected packets to the concerned user. The main cause of data loss is the interference of the ISP (Internet Service Provider) and firewall security applications. SWITZERLAND uses P2P (Pier to Pier) technology. This application can also identify the packets with a random pattern. It uses multi client functionality by which it can detect the loss data of more than one user connected to the same server. It also identifies the user to which the data belongs. SWITZERLAND is an application which is not restricted to the TCP technology in its functionality.

How to use Switzerland
How to run tests well basically any packets exchanged between Switzerland & client connected to same server are automatically tested. But to test across different server you can make use of there wiki page where there is a list of bit Torrent seeded and download.

For more info check it out.