I found the problem, it was Exchange Server that is sending severarl multicast packages Thanks
Hi  Today I installed Wireshark in my computer to detect what packets I'm receiving. As I understand I should receive only packets explicitly sent to my computer, however I can see traffic that belogs to several other computers. They are not broadcast packets, for example I could see packets sent from PC1 to SMTPServer in port 25. Any idea why this happens?
PowerConnect 5448 sending packets to everybody