I'm connected to a LAN in my office, which has many users. Using NAT all the machines get a global IP address through which they can access Internet. What i'm trying to figure out is, is it possible using a sniffer like Wireshark, to determine who's consuming the most bandwidth or which IP address is downloading maximum content from the Internet, slowing down others' connectivity speed.
I tried using Wireshark in promiscuous mode , but don't know what filters to apply in order to sniff download traffic of other machines.
So how can i go ahead and achieve this network monitoring ?