ARPtool has basically two functions: 1) it maps all the ip's on the same ethernet cable segment/LAN as the machine it runs on, which is useful to determine the hosts that could be victim of sniffing, hijacking, etc. 2) a general ARP generator function, for sending customized ARP packets, which can be used for spoofing hosts, DoS, etc.
ARPtool has basically two functions: 1) it maps all the ip's on the same ethernet cable segment/LAN as the machine it runs on, which is useful to determine the hosts that could be victim of sniffing, hijacking, etc. 2) a general ARP generator function, for sending customized ARP packets, which can be used for spoofing hosts, DoS, etc.