Class diagram for ARP:
class ARP usi++.h
Open device 'dev' for packet-capturing (ARP-packets) ARP-objects don't need to call init_device().
Return the source-hardware-adress of a ARP-packet
Return the destination-hardware-adress.
Get source protocol-adress.
Return the ARP-command.
[virtual]
Sniff for an ARP-request/reply ...