Sequence number recovery in stateful devices
US10951536B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2019 |
| Grant date | Mar 16, 2021 |
| Priority date | — |
| Expiry date | Oct 2, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/324
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a network security device configured to monitor a communication session between a first device and a second device generates a first empty acknowledgment packet specifying a first sequence number and sends the first empty acknowledgment packet to the first device. The network security device may thereafter determine that a response from the first device has not been received within a threshold amount of time and generate, at least partly in response, a second empty acknowledgment packet specifying a second sequence number. The network security device may send the second empty acknowledgment packet to the first device and receive, from the first device, a third empty acknowledgment packet specifying a third sequence number. The network security device may then store the third sequence number in association with the communication session between the first device and the second device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.