PROBE
loader

What the port Probe scan tool does is that it uses nmap to test if you have open ports.

It can only do so for TCP as UDP is connection-less ( you can't test if the packet was received or not on a destination )

You can use iptables to block ports IPTABLES -I INPUT -p -s --dport -j DROP to block requests

The tool does a test to see if your host is up by pinging. Be sure it allowes ping first.

You can get more information about the nmap project on their mainpage at http://nmap.org/