Network address translation with IP redundancy
US8001269B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2002 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Sep 19, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/40
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Redundant gateway methods, apparatus and systems using more than one gateway device in a gateway device group for communications directed outside of a LAN. Failover services are thus provided in the event that an active router or other gateway device fails. Network address translation (NAT) services are provided simultaneously by having all gateway devices in the redundancy group create and maintain IP aliases and static NAT mappings, while disabling all gateway devices operating in a non-active mode from replying to address resolution protocol requests from hosts. A gateway device may be configured to operate in a redundancy group in an active operating mode or a non-active operating mode. The gateway device handles transmissions into and out of the network to which it is connected only when the gateway device is in the active operating mode so as to avoid system corruption due to ARP activity and message transmissions by non-active gateway devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.