Methods and apparatus for protecting against IP address assignments based on a false MAC address
US7320070B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2003 |
| Grant date | Jan 15, 2008 |
| Priority date | — |
| Expiry date | Jul 23, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2101/622
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus detecting attempts to obtain IP addresses by faking a MAC address in a data portion of an IP address request message are described. In accordance with the present invention, rather than use standard address allocation protocols, e.g., ARP, the DNS DCHP contacts the requesting edge router via a private secure network. The MAC address received in the address request is compared to the MAC addresses stored in the edge routers port/MAC address resolution table. If the MAC address received in the request message cannot be found in the edge router's table which was created from the MAC address included in the message's header, a fraudulent attempt to obtain a MAC address is declared. The fraudulent attempt to obtain an IP address can be reported and steps taken to identify the perpetrator of the fraud.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.