System and method for redirecting network traffic to provide secure communication
US6321336A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1998 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Mar 13, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication security system is described which uses a server to communicate to an unprotected network, such as the Internet. The system intercepts an IP packet prior to stack incursion and replaces the destination address with that of a firewall's network interface address. Because of the modification to the IP header destination address, an IP header checksum is recalculated prior to presentation to the local stack. The system uses a shim to replace the destination address and store the original destination address. When a communication is authorized, the firewall performs a system call to retrieve the original destination address such that the data communication can be routed to the indented destination address.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.