Patent ID: 8181237
Filing Date: 2012-05-15
Classification: H04L

Abstract:
1. A method of preventing unauthorized user access to a computer network, comprising: receiving a domain name server resolution request at the computer network from a requesting user; replying to the requesting user with a domain name server resolution and internet protocol address of a target device within the computer network; inspecting the reply to the requesting user with a network security device, where the network security device does not have an assigned internet protocol address; monitoring data traffic to the computer network with the network security device to detect a reply to the internet protocol address of the target device from the requesting user; intercepting the reply to the internet protocol address of the target device from the requesting user with the network security device wherein the reply to the internet protocol address of the target device from the requesting user is received by the network security device; and verifying that the requesting user is authorized to access the computer network with the network security device.