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Peer-to-peer (P2P) connection despite network address translators (NATs) at both ends

  • US 7,590,758 B2
  • Filed: 12/12/2007
  • Issued: 09/15/2009
  • Est. Priority Date: 01/15/2003
  • Status: Expired due to Term
First Claim
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1. A method of determining a port ID for a symmetric network address translator (NAT), the method comprising,requesting, from a symmetric NAT residing on a first network device, a plurality of port identification numbers (IDs) previously assigned, by the symmetric NAT, for a plurality of distinct connections associated with the symmetric NAT, respectively;

  • andreceiving information at a second network device regarding the plurality of port IDs from the first network device; and

    predicting a port ID for use by the second network device based on a historic pattern for assigning port IDs derived from the information received at the second network device from the first network device.

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