PAT addresses

boswd83

Having a bit of trouble understanding what addresses are used where in PAT.

Should an Inside Global address be a private or public address?

I had been thinking it should be public (for the hosts to be translated to), but I have a study guide which shows an example of an Inside Global address as 172.16.99.2 - which is a private address?

Now very confused, any help would be appreciated.

thanks

networker050184

The inside global would be the address you are overloading.

kryolla

Inside global does not have to be a public address. With NAT it prevents the global side from seeing the addressing in the local side. All NAT does is translate ip from inside local to inside global whatever address they are using. Well it does other things as well such as load balancing between servers but that is beyond NA level

mattrgee

For example:

Inside Local:my private ip address
Inside Global:my public ip address

Outside Global: your public ip address
Outside Local: your private ip address

Like kryolla said though, the Global addresses are not necessarily public addresses.