The organization that I work for has been experiencing Internet problems over the past few months. Throughout the day the Internet slows to a crawl and is unusable. The problem is very periodic however. Our ISP stated that a computer on the network is sending out a large number of small packets that is overwhelling our upload bandwidth. We are worried that one of the computers has been taken over and is sending out spam. There are about 30 people in the office which makes finding the problem difficult. How should we go about finding where the packets are being sent from? Thanks.