Host Discovery

NMAP Host discovery

nmap -sn -PR

-sn disables port scan

-PR arp scan on host

other nmap scans to discover host.

sudo nmap -sn -PU   //UDP ping scan
nmap -sn -PE   //ICMP ping scan. Normal ping scan
nmap -sn -PE   //check live hosts on network range
nmap -sn -PM    //Mask Ping scan (use if ICMP is blocked)
nmap -sn -PP    //ICMP timestamp scan
nmap -sn -PS    //tcp syn ping scan
nmap -sn -PO     //IP protocol scan.use different protocols to test the connectivity

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