Different types of Network Address Translation (NAT)

veritas_libertas

I have to admit that I was taken aback when I ran into DNAT, Static NAT, and Overloading. Odom's book only touched on this lightly and Lammle was a little deeper. I still don't feel like I fully understand what the differences are. Here is what I think it means and please correct me if I'm wrong

Static NAT:

Allows the mapping of individuals hosts to outside IP addresses. This is not dynamic and allows for only ONE host to ONE IP.

Dynamic NAT:

This is where I get a little confused. The way I'm reading it you have a pool of outside addresses that can be assigned but it's like Round Robin and once you run out the rest of the inside hosts don't get the option to leave their network.

Overloading:

Basically the same thing my DSL modem does? All of the hosts can take on the IP of my DSL connection to reach out to the Internet?

Monkerz

Overloading is also known as NAPT which is a combination of NAT with PAT. A single address is used my many hosts by utilizing port numbers.

veritas_libertas

Monkerz wrote: »

Overloading is also known as NAPT which is a combination of NAT and PAT. A single address is used my many hosts by utilizing port numbers.

Thanks.

So was I spot on, or a little off on my assumptions?

Monkerz

I'd say you are understanding the reading quite well.

mgeorge

Its easier to understand when you see it in action;

Configuring IP Services | Free CCNA Workbook

Check out the first 3 labs.

veritas_libertas

Thanks for pointing out that web site. I couldn't remember what the URL was.