ettercap mitm

sudo ettercap -T -q -i en1 -w dump -M ARP /192.168.0.4/ /192.168.0.1/

I browse couple of website with the target computer (192.168.0.4) then stop the capture. I run Wireshark and open the dump file generated by ettercap and I got want I wanted for 2 days: the dump of the communication between the computer 192.168.0.4 and the default gateway.
Here is a short description of the command:
sudo: It is to run the command with all privileges.
ettercap: the application for the ARP poisoning and the sniffing of the communication.
-T -q: It is to use ettercap with the text interface (command line).
-i en1: It is to use the interface en1 (wireless) connected to the network where I want to perform the MITM attack.
-w dump: It stores the captured communication in the file named dump in a format readable by Wireshark.
- M ARP: It is the option for performing a MITM attack with the ARP poisoning method.
/192.168.0.4/: It is the victim’s IP address.
/192.168.0.1/: It is the default GW IP addres