Solved

Router NAT/Transparent Mode

Posted on 2006-11-06
4
2,884 Views
Last Modified: 2013-11-29
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?
http://www.fureai.or.jp/~htamura/gif/Snap4.gif
0
Comment
Question by:Hiroyuki Tamura
4 Comments
 
LVL 4

Accepted Solution

by:
periferral earned 50 total points
ID: 17883416
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.

0
 
LVL 77

Assisted Solution

by:arnold
arnold earned 75 total points
ID: 17883435
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.)
0
 

Author Comment

by:Hiroyuki Tamura
ID: 18047989
thank you, all:)
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Pfsense - and other email Servers 8 48
Manage ASA using outside IP 14 62
decoding the error message TEI_ASSIGNED 8 40
Internet testing device? 5 31
If you're not part of the solution, you're part of the problem.   Tips on how to secure IoT devices, even the dumbest ones, so they can't be used as part of a DDoS botnet.  Use PRTG Network Monitor as one of the building blocks, to detect unusual…
For many of us, the  holiday season kindles the natural urge to give back to our friends, family members and communities. While it's easy for friends to notice the impact of such deeds, understanding the contributions of businesses and enterprises i…
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question