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:
Apr. 21, 2026
Filed:
May. 16, 2023
Microsoft Technology Licensing, Llc, Redmond, WA (US);
Paul David Mattes, Saint Paul, MN (US);
Umesh Krishnaswamy, San Jose, CA (US);
Ashlesha Atrey, Sunnyvale, CA (US);
Guruprasad Bangalore Hiriyannaiah, Fremont, CA (US);
Microsoft Technology Licensing, LLC., Redmond, WA (US);
Abstract
Bi-directional tunnel probing in a network may be extended to multi-realm networks, providing bi-directional probing in a multi-realm network. Bi-directional probing uses probe packets with a forward tunnel label, a reverse tunnel label, and an IP packet header. Bi-directional probing in a multi-realm network uses a forward tunnel label, an SID, a reverse tunnel label, and an IP packet header. Penultimate hop popping strips the outermost labels in a specific order. The SID gets the probe packet back into the originating realm, and the reverse tunnel label returns the probe packet along the reverse direction of the tunnel. No SID is needed for intra-realm probing, and the IP packet header is used to return the probe packet if the reverse tunnel label is absent.