I'm training myself on network scanning and i'm focusing on how to identify a sniffer on my net. Searching on the web, i find that a possible way is the ARP method: i must send an ARP request to a suspect no broadcast IP to check if it's in promiscuous mode.
My doubt is: if my pc is a Windows 7 machine, is there a way to send manually an ARP resuest? Possibly from command line?
You can use tools like nmap.
nmap -sP -PR <IP address/subnet>
For windows you can use the GUI version of nmap - zenmap.