>>377 $ /opt/local/bin/port search arp |grep net/ arpd net/arpd 0.2 user space ARP (Address Resolution Protocol) daemon arping net/arping 2.04 utility to find out if a MAC address is already taken on a LAN arpwatch net/arpwatch 2.1a15 Monitor ARP & RARP requests ucarp net/ucarp 1.1 userland implementation of the CARP MacPortsにはarpscanはないみたいだけど、arpingで足りるんじゃない?