fix retrieval of mac by ip from arp cache
fix retrieval of mac by ip from arp cache

meskal/ffff-next,RedDog99/bielefeld,ffff-next/ffff-next,meskal/ffff-next,ffff-next/ffff-next,meskal/ffff-next,ffff-next/ffff-next,ffff-next/ffff-next,RedDog99/bielefeld,RedDog99/bielefeld