An embodiment may include circuitry in a controller that may be included in a host that has at least one processor. The circuitry may maintain a correlation between a set of network addresses and a set of medium access control (MAC) addresses. The correlation may be generated, at least in part, by at least one process to be executed, at least in part, by the at least one processor. The circuitry may determine, based at least in part upon the set of network addresses, whether to generate at least one response to at least one request. If the circuitry determines to generate the at least one response, the circuitry may generate the at least one response based at least in part upon the correlation and at least one network address associated with the at least one request. Many alternatives, variations, and modifications are possible.