Wireless firewall with tear down messaging
US7555772B2 · kind B2 · utility
6Cited by
0References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2004 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Jun 30, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/30
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods of screening incoming packets are provided. A first firewall detects a tunnel formation. A second firewall maintains a list of open firewall sessions. Each tunnel has one or more associated firewall sessions. The first firewall detects variable situations, such as when the tunnel is torn down, and notifies the second firewall so that, for example, the second firewall can act to clear an associated firewall session from the firewall session list. Incoming packets that are associated with firewall sessions that have been cleared from the firewall session list may not be passed through the second firewall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.