 Using wireless access points in SSID-hidden mode (network cloaking), a mobile wireless device may not only disclose its own MAC address when traveling, but even the MAC addresses associated to SSIDs the device has already connected to, if they are configured to send these as part of probe request packets.Alternative modes to prevent this include configuring access points to be either in beacon-broadcasting mode, or probe-response with SSID mode.In these modes, probe requests may be unnecessary, or sent in broadcast mode without disclosing the identity of previously-known networks.