Methods, systems, and computer readable media can be operable to facilitate an automatic detection of WAN (wide-area network) configurations. A CPE (customer premise equipment) device may generate and output one or more probing packets to one or more upstream network elements. The CPE device may receive one or more probing packet responses from one or more of the upstream network elements. Based upon the received probing packet response(s), the CPE device may determine WAN configurations and parameters, and the CPE device may set WAN configurations accordingly.