====== Nmap ======

= nmap - Network exploration tool and security scanner =

====== Install ======
It might be installed as default. If not:
 apt-get install nmap

====== Example ======
 nmap -P0 -sT -F -o -A ip.address.here
 
 <nowiki>//</nowiki> -P0 = do not try to ping ipaddress. Some firewalls block ICMP
 <nowiki>//</nowiki> -sT = TCP scan
 <nowiki>//</nowiki> -F = Fast scan. Only scan specified ports via default nmap
 <nowiki>//</nowiki> -A = additional info
 <nowiki>//</nowiki> -o = clean output (not needed)

====== Test for open UDP Port ======
So telnet will not check to see if a UDP port is open on a host. You'll need nmap for this.

 nmap -p udpport -sU ipaddress
 #You may have to try the above a few times to check and see

Ref: http://techgurulive.com/2008/09/16/how-to-test-udp-connectivity/