Preventing duplicate sources from clients served by a network address port translator
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United States of America Patent
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Feb 2, 2016
Grant Date -
Aug 28, 2014
app pub date -
May 6, 2014
filing date -
Apr 11, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
Preventing duplicate sources in a network that uses network address port translation on an established connection. In response to receiving an inbound packet at a destination host, input values are obtained therefrom and used to consult a mapping. If no match is found, a translation is performed, whereby a determination is made as to whether or not a port number is available within a range of port numbers that comply with a security association governing the connection. If so, an available port number is assigned to the connection, thereby avoiding a possibility of a duplicate source. If a port number is not available, the packet is rejected.
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