Method and apparatus for detecting a router that improperly responds to ARP requests
US7729292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2008 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | Aug 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L61/103
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system that detects a non-compliant router that incorrectly responds to all address-resolution-protocol (ARP) requests, including ARP requests and ARP probes for link-local IP addresses. This is accomplished by sending an ARP request asking for an Ethernet address associated with a link-local IP address, wherein the link-local IP address is a reserved link-local IP address, which should not be assigned to any device. If a response is received to the ARP request, the system determines that the response was sent by a non-compliant router that incorrectly responds to all ARP requests, including ARP requests for link-local IP addresses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.