import pcap    import binascii            a = pcap.pcap()    a.setfilter('arp')        for i,j in a:        if binascii.hexlify(j[21])=="02":            print 'Mac Reply!'            for index in range(len(j)):                if index>=22 and index<=27:                       print binascii.hexlify(j[index])+":"            print "Over"            break