Further, the WoL protocol operates on a "deeper level" in the multi-layer networking architecture. To ensure the "Magic Packet" gets from source to destination, while the destination is "sleeping", the ARP Binding (aka IP & MAC binding) must typically be set in a NAT Router. This allows the Router to forward the "Magic Packet" to the "sleeping" computer's MAC adapter at a networking layer below typical IP usage. In the NAT router ARP (aka MAC & IP) binding requires just a dedicated IP number and the MAC address of the destination computer. There are some security implications associated with ARP binding (see ARP spoofing) however as long as none of the computers connected to the LAN are compromised, an attacker must use a computer that is connected directly to the target LAN (plugged into the LAN via cable, or gains free access to the LAN by breaking through the Wi‑Fi connection security).