| Name | Location of Host | IP Address Space in Which Address Exists |
|---|---|---|
| Inside local | Inside the network | Part of the enterprise IP address space – private IP |
| Inside global | Inside the network | Part of the public IP address space |
| Outside local | In the public Inet | Part of the enterprise IP address space – private IP |
| Outside global | In the public Inet | Part of the public IP address space |
These are key terms to help you understand static NAT:
- NAT inside interface—The Layer 3 interface that faces the private network.
- NAT outside interface—The Layer 3 interface that faces the public network.
- Local address—Any address that appears on the inside (private) portion of the network.
- Global address—Any address that appears on the outside (public) portion of the network.
- Legitimate IP address—An address that is assigned by the Network Information Center (NIC) or service provider.
- Inside local address—The IP address assigned to a host on the inside network. This address does not need to be a legitimate IP address.
- Outside local address—The IP address of an outside host as it appears to the inside network. It does not have to be a legitimate address, because it is allocated from an address space that can be routed on the inside network.
- Inside global address—A legitimate IP address that represents one or more inside local IP addresses to the outside world.
- Outside global address—The IP address that the host owner assigns to a host on the outside network. The address is a legitimate address that is allocated from an address or network space that can be routed.