ARP Scout
Wait for a network device to come online and run an associated script
...ARP Scout monitors either the Linux Proc file system for changes in the the ARP cache or will use PCAP to watch for new MAC and IP address combinations.
See the README file for more details.
Note:
Last updated on November 27th, 2011
See the CHANGE file for details.
The last change was a small bug fix and tested on OS X.