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:
May. 13, 2014
Filed:
Sep. 14, 2012
Murari Sridharan, Sammamish, WA (US);
Deepak Bansal, Redmond, WA (US);
Eran Yariv, Zichron, IL;
Ronen Barenboim, Haifa, IL;
Maxim Stepin, Redmond, WA (US);
Alexander Malvsh, Bothell, IL;
Murari Sridharan, Sammamish, WA (US);
Deepak Bansal, Redmond, WA (US);
Eran Yariv, Zichron, IL;
Ronen Barenboim, Haifa, IL;
Maxim Stepin, Redmond, WA (US);
Alexander Malvsh, Bothell, IL;
Microsoft Corporation, Redmond, WA (US);
Abstract
Discovery of intermediate network devices is performed using a technique that piggybacks upon the existing standard TCP (Transport Control Protocol) 'SACK' (Selective Acknowledgment) option in a SYN/ACK packet so that discovery information may be shared between pair-wise-deployed peer intermediate devices when a TCP/IP connection (Transport Control Protocol/Internet Protocol) is first established between network endpoints using a conventional three-way handshake. Use of the SACK option is combined with another technique which comprises modifying the original 16-bit value of the TCP receive window size to a special arbitrary value to mark a SYN packet as being generated by a first peer device. The marked SYN when received by the second peer device triggers that device's discovery information to be piggybacked in the SACK option of the SYN/ACK packet. The first device then piggybacks its discovery information in the SACK option of the ACK packet which completes the three-way handshake.