STUN

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STUN

(Simple Traversal of UDP through NAT) A protocol that allows applications to detect that a network address translation (NAT) is being used. It can also detect the type of NAT and IP address assigned by it. STUN was developed to support interactive, two-way communications over the Internet such as for voice (VoIP) and videoconferencing. The STUN client sends requests to a STUN server, which is typically hosted by the service provider.

Unlike application layer gateways (ALGs) and Middlebox Communications (MIDCOM), which also support two-way communications through NATs, STUN requires no changes to the NAT. See NAT.
References in classic literature ?
He went like one that hath been stunned, And is of sense forlorn: A sadder and a wiser man, He rose the morrow morn.
Gradgrind, stunned as usual, collapsed and gave it up.
The creature fell stunned, and the force of its fall brought it within the reach of dexterous hunter's grasp.
Several passengers, shot or stunned, lay on the seats.
that appeal the stunned intelligence still faintly answered--and to no other.
Zarathustra himself, however, stunned and strange, rose from his seat, looked around him, stood there astonished, inquired of his heart, bethought himself, and remained alone.
"For the love of Mike," Daughtry pleaded, all of stunned belligerence gone from him in his state of stunned conviction that the dread disease possessed him.
"The blow you struck her with the thing you call rifle stunned her," she explained, "and then I swam in close enough to get my knife into her heart."
The thought was almost like a physical blow in the face--it stunned me.
I believed my eyes without question, and yet I was for the moment stunned by what they disclosed to me.
He seemed much stunned, and as they led him into a shop he walked as if he were in great pain.
Tom was so stunned that he had not even presence of mind enough to say "Who cares, Miss Smarty?" until the right time to say it had gone by.