Disclosed approaches for protecting against attacks on a local network device include establishing an access period associated with one remote network device of a plurality of remote network devices. The router rejects messages from remote network devices of the plurality of remote network devices not having associated access periods. The router forwards to the local network device, a message received from the one remote network device during the access period. The router rejects, in response to expiration of the access period, subsequent messages from the one remote network device to the local network device.