linux - Find mac address on python -

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i have searched identifier , tried find mac address connected device on server problem output returns empty example

a = os.popen("arp -a 192.168.6.150 | awk '{print $4}'").readlines()

a empty

i'm working on captive portal page untangle. want mac address ip of device on network. code runs on apache server.

from mod_python import apache mod_python import util

the following function returns mac or none if mac not found.

import commands def getmac(iface):     mac = commands.getoutput("ifconfig " + iface + "| grep hwaddr | awk '{ print $5 }'")     if len(mac)==17:         return mac  getmac('eth0')

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