The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2015
Filed:
Dec. 04, 2008
Qingwei Lin, Beijing, CN;
Jiang LI, Beijing, CN;
Jian-guang Lou, Beijing, CN;
Yusuo HU, Beijing, CN;
Fan LI, Beijing, CN;
Qingwei Lin, Beijing, CN;
Jiang Li, Beijing, CN;
Jian-guang Lou, Beijing, CN;
Yusuo Hu, Beijing, CN;
Fan Li, Beijing, CN;
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
Techniques described herein enable peers to determine each peer's NAT type much more efficiently and quickly than when compared with existing techniques. To do so, a peer simultaneously sends multiple test messages to a server. The peer then waits to either receive a response for each of the multiple test messages or may store an indication that no response has been received after a predetermined timeout period. The peer then analyzes the received responses and/or the stored timeout indications to determine the peer's NAT type or to determine that the peer is operating free from concealment by a NAT/firewall device. By simultaneously sending the multiple test messages, the peer may determine the NAT type within a maximum time defined by the predetermined timeout period or a roundtrip time period that is required for communication between the peer and the server. As such, the tools allow for efficient NAT-type detection.