Router NAT/Transparent Mode

i have fortigate 100. what is NAT/Transparent Mode? what's the difference?
why they have to change default setting when switching to NAT to Transparent?
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Hiroyuki TamuraField EngineerAsked:
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periferralConnect With a Mentor Commented:
NAT is layer 3. It is used to change the IP addresses of private IP addressing to public IP addressing.
For example, if you have a network inside 192.168.0.X, this is a private IP address. You will then NAT this IP address to something else like 76.32.33.54 which is an internet routable IP address. This is commonly used in Routers and wireless gateways that connect to the internet.

Transparent mode means this is layer 2. This means that the device does not really have an IP address (in reality however one is assigned). Transparent mode is used in splitting up networks into 2 networks, secure and insure in cases of firewalls. For example. if you have a range of addresses 192.168.0.0-255. Lets says some of these machines are just hosts but others are servers. A sysadmin will split this network into 2 192.168.0.0-127 255.255.255.128 and assign these to hosts and then the other 128 to the servers. Then put a firewall in between them in transparent mode. Now even though all machines are a part of 1 network, you can firewall in between using layer 2, rather than layer 3. You need VLANs to separate the 2 networks.

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arnoldConnect With a Mentor Commented:
transparent mode means that the routees work does not require an alteration of the other systems.  In a NAT mode, the client systems will likely be assigned new IPs (in NAT that usually means that those will be private ips such as 192.168.0.4 with the router having the IP 192.168.0.1 which is also the default gateway.)
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Hiroyuki TamuraField EngineerAuthor Commented:
thank you, all:)
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