Hi!
Try by unplugging the wireless adapter, there’s no need for it. Then flush iptables rules and enable packet forwarding again:
iptables –flush
iptables –table nat –flush
iptables –delete-chain
iptables –table nat –delete-chain
iptables -P FORWARD ACCEPT

Enable port forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

Then run the attack again.

Let me know how it goes!
Diego