Ubuntu - nmap - Scan remote hosts using TCP ACK (PA) and TCP Syn (PS)

Sometimes packet filtering firewalls block standard ICMP ping requests.

In that case, use TCP ACK and TCP Syn methods to scan remote hosts.

sudo nmap -PS 192.168.1.69

result:

Starting Nmap 6.40 ( http://nmap.org ) at 2016-07-08 01:22 BST
Nmap scan report for peter-laptop-1 (192.168.1.69)
Host is up (0.0000060s latency).
Not shown: 997 closed ports
PORT    STATE SERVICE
80/tcp  open  http
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
 
Nmap done: 1 IP address (1 host up) scanned in 2.44 seconds