ARP Responder (with python)

arp_responder.py

# sudo apt install -y python3-scapy
from __future__ import print_function
from scapy.all import *

iface = "vxlan42"        
vxlan_mac = get_if_hwaddr(iface)

def handle_packet(packet):
    if packet[ARP].op == ARP.who_has:
        print(packet.summary())
        
        reply = ARP(op=ARP.is_at, hwsrc=vxlan_mac, hwdst=packet.src, psrc=packet.pdst,  pdst=packet.psrc)
        go = Ether(dst=packet.src, src=vxlan_mac) / reply
        sendp(go, iface=iface)   
    return

sniff(iface=iface, filter="arp",prn=handle_packet)