Traditional NAT

Traditional NAT is the most common method of using address translation. Its primary use is translating private addresses to legal addresses for use in an external network. When configured for dynamic operation, hosts within a private network can initiate access to the external (public) network, but external nodes on the outside network cannot initiate access to the private network.

Addresses on the private network and public network must not overlap. Also, route destination advertisements on the public network (for example, the Internet) can appear within the inside network, but the NAT router does not propagate advertisements of local routes that reference private addresses out to the public network.

There are two types of traditional NAT—basic NAT and NAPT.

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