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So you have set up your 48 and it's now time to connect your local area network into one of its interfaces.

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On the other side on the Internet facing interface your when interface you will connect it to your ISP

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and assume that you have dozens or even hundreds of computers and only one public IP address.

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What can you do.

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Well you use net network address translation you're 48 acts as an agent that translates private IP addresses

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into your one public IP address without net.

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We would have need to purchase a full class address range for our computers.

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Now what does that do 48 actually changes the IP address clear of every packet.

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So just imagine that by using a 24 subnet you can use up to 200 and 54 IP addresses.

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That's amazing.

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Using only one public IP address.

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Now there are several types of Net.

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We will look at them.

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There is the part which is the port address translation in 48.

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We call it net overload.

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There is the central net there is the virtual IP.

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But before we go over to the different types of net we need to understand or to distinguish between

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two types of net for an outgoing traffic.

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We use a source net for incoming traffic.

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We use destination net and net as you will see is part of your firewall policy.

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It is integrated with it and you will use it in different scenarios.