The menu Network Protection > NAT allows you to define and manage NAT rules of the gateway. Network Address Translation (NAT) is the process of rewriting the source and/or destination addresses of IP packets as they pass through a router or gateway. Most systems using NAT do so in order to enable multiple hosts on a private network to access the Internet using a single public IP address. When a client sends an IP packet to the router, NAT translates the sending address to a different, public IP address before forwarding the packet to the Internet. When a response packet is received, NAT translates the public address into the original address and forwards it to the client. Depending on system resources, NAT can handle arbitrarily large internal networks.