Gateway shared by multiple virtual private networks
US7640319B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Sep 22, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/2592
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A VPN gateway for interfacing two or more VPNs to external networks such as the internet or a PSTN having different addressing schemes, has a NAT shared by the VPNs for converting VPN addresses to addresses of the external network. An advantage of this is reduced number of additional network elements, e.g. boxes, and fewer additional addresses. The NAT can be a source and destination NAT, arranged such that entities in the external networks appear to have an address within an address range of the respective VPN. Thus, entities in the external resource can appear as trusted resources inside the VPN. The gateway can incorporate a converter for converting between formats such as VoIP packets and TDM calls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.