The names we use to describe the addresses used with NAT are pretty simple. Addresses used after NAT translations are called global addresses. These are usually the public addresses used on the Internet, but remember, you don't need public addresses if you aren't going on the Internet.
Local addresses are the ones we use before NAT translation. So, the inside local address is actually the private address of the sending host that's trying to get to the Internet, while the outside local address is the address of the destination host. The latter is usually a public address (web address, mail server, etc.) and is how the packet begins its journey.
After translation, the inside local address is then called the inside global address and the outside global address then becomes the name of the destination host. Check out Table 11.2, which lists all this terminology, for a clear picture of the various names used with NAT.
Local addresses are the ones we use before NAT translation. So, the inside local address is actually the private address of the sending host that's trying to get to the Internet, while the outside local address is the address of the destination host. The latter is usually a public address (web address, mail server, etc.) and is how the packet begins its journey.
After translation, the inside local address is then called the inside global address and the outside global address then becomes the name of the destination host. Check out Table 11.2, which lists all this terminology, for a clear picture of the various names used with NAT.
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