ARP Scanning!

Implemented in 3.83.DC13 with -PR

# nmap -n -sP -PR --packet_trace --send_eth 192.168.33.37

Starting nmap 3.83.DC13
SENT (0.0060s) ARP who-has 192.168.33.37 tell 192.168.0.100
SENT (0.1180s) ARP who-has 192.168.33.37 tell 192.168.0.100
Note: Host seems down. If it is really up, but blocking our ping probes, try -P0
Nmap finished: 1 IP address (0 hosts up) scanned in 0.231 seconds