ARP on fixed IP

arp_ip.py

import subprocess
from datetime import datetime
ip_addr = 'XX.xx.xx.xx'
mac_addr = 'XX:XX:XX:XX:XX'
server_name = 'SERVER_NAME'
log_file = 'path/log'
command = 'arp {}'.format(ip_addr)
process = subprocess.Popen(command.split(' '), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = process.communicate()
if mac_addr not in out:
    with open(log_file, 'a') as f:
        f.write('##### Change MAC {server_name} ####\n{date_info}\n#######\n{info}'.format(
            server_name=server_name, date_info=datetime.now(), info=out)
            )
    print(out)