Network Address Translation (NAT), as the name implies, is a means of mapping one address space into another address space. It is often equated with port forwarding, a subcategory of NAT that allows a computer on a public network, such as the internet, to connect to a computer on a private network (for example, our LAN) by remapping the IP address and port. This is the form of NAT that you are most likely to use. But there two are other forms of NAT, which we will cover in this section. Outbound NAT allows traffic from internal networks whose destination is an external network to reach their destination. 1:1 NAT is a form of remapping public IP addresses to private IP addresses in such a way that each public IP address corresponds to one private IP address.