Method and apparatus for detecting a router that improperly...

Details Method and apparatus for detecting a router that improperly... Method and apparatus for detecting a router that improperly...

2005-04-04

2008-10-14

Kizou, Hassan (Department: 2619)

Multiplex communications

Network configuration determination

C370S352000, C370S389000, C370S395540

Reexamination Certificate

active

07436783

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 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.

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“Dynamic Configuration of IPv4 Link-Local Addresses”, by Stuart Cheshire et al., The Internet Society 2004, Jul. 8, 2004, Zeroconf Working Group, Internet-Draft, <draft-ietf-zeroconf-ipv4-linklocal-17.txt>.

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