Redundancy support for network address translation (NAT)
US7647427B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2002 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Feb 19, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L49/354
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Stateful failover redundancy support is provided for network address translation (NAT). A master NAT device is backed-up with at least one back-up NAT device. Existing sessions are synchronized between the two NAT devices, such as via a dedicated link between them. In the event of a failover where the master NAT device is unable to perform its NAT functions, ownership of Internet protocol (IP) addresses is transferred from the master NAT device to the back-up NAT device. The back-up NAT device, which is now owner of the IP addresses, assumes the NAT functionality associated with these IP addresses and continues the existing sessions, as well as processing new sessions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.