A method of client authentication that includes receiving an Internet protocol source address of a client packet and determining a packet origination, a network connection point, and a network path of the client packet. The method further includes comparing the determined packet origination with at least one packet origination associated with the client, comparing the determined network connection point with at least one network connection point associated with the client, and assessing a compatibility between the determined network path and at least one of the determined packet origination or the determined network connection point. The method includes signaling execution of client authentication challenges when either of the two comparisons fails and/or the determined network path is incompatible with at least one of the determined packet origination or the determined network connection point.