This is a development fork of arpwatch. This has been threaded in order to better deal with the requirements of multi-interface routers. Information regarding MAC addresses and interfaces is maintained by the program, and an alert is issued should a device move between interfaces. In addition, event processing has been refactored, and some bugs have been fixed. see net-mgmt/arpwatch/pkg-descr for more information about arpwatch 2.x Matthew George