Thanks for responding. Yes! March Jessie works..the newer versions fail..very easy to test. #! /usr/bin/env python from scapy.all import sniff from scapy.all import ARP def arp_monitor_callback(pkt): if ARP in pkt and pkt[ARP].op in (1,2): #who-has or is-at return pkt.sprintf("%ARP.hwsrc% %ARP.psrc%...