Tool to test UDP ports from public internet back to internal IP address

Hello: I am needing to test some UDP ports from the internet back to my internal network. How can I accomplish this...
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
nmap is popular for scanning and testing ports. Of course it is more difficult to test with UDP ports, unless you get a readable response from the service to contact.
Usually you just open the port with nmap, and then look at server or firewall logs to see if everything has been fine.
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Natty GregIn Theory (IT)Commented:
shields up can check for you by Gibson research
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