Nmap

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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

// -P0 = do not try to ping ipaddress. Some firewalls block ICMP
// -sT = TCP scan
// -F = Fast scan. Only scan specified ports via default nmap
// -A = additional info
// -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/

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