Measuring Dropped packets in Network through wireshark

Monitoring the all network traffic from one port on the switch and captured the all traffic bu using wireshark. Here i found all packet captured in the summary result and it has dropped packet information also. This is some thing lost packets in the network or开发者_如何学运维 at the wireshark point? I was in ambiguous...i am testing in ethernet based and TCP/IP based protocol.

One more possible case if my server is installed with wireshark and its capturing the all packets coming and going from this point. At this point also found the packet dropped in the wireshark summary. So any one help in this issue....any explanation appreciated. thanks.... Chirug

Surely wireshark is only telling you about packets it has dropped? I can't see how it could possibly know about any others.