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Wireless Sensor Networks (WSN) implemented across a large campus can provide advanced levels of monitoring and control, and authenticated access, over the complete dynamic environment. Access to these WSNs should be controlled and proper authentication schemes designed to prevent unauthorized access. Where access route to a device is not directly available, the authentication scheme must perform effectively over multiple hops. With Distance bounding (DB) protocols, the physical proximity of 2 or more parties is detected and verified. Modification of these protocols allows for extension of the verification to multi hop neighbours. This paper evaluates the performance of the network when routing is done using common wireless protocols and the nodes are under attack. This approach will allow for increased accuracy, while having minimal or no impact on the other transmission parameters.