Non-intrusive knowledge suite for evaluation of latencies in IP networks
US7742415B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Oct 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L43/106
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A determination of latency in IP networks is performed by sensing packets, determining a status of the sensed packets and comparing original packets with acknowledgements (ACKs). A packet header on a physical layer interface (e.g., int 0) is sensed. A determination is made of a sensed packet status. If the packet is sensed, a hashed record of the packet header is created, including a local clock time of when the packet was sensed. A determination is made as to whether the packet represents an ACK to a previously sensed TCP packet. If the packet represents an ACK to a previously sensed packet, a time delay between the previous sensing of the packet and the ACK is calculated. The time delay is the TCP ACK Round Trip Time (TCP RTT).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.