Nat Example - Colubris Networks CN3000 Administrator's Manual

Chapter 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - How it works - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Chapter 2
The CN3200 reserves 50 ports for each user starting at port 5000. Therefore, if you
enable this feature you should not assign static NAT mappings in the range 5000-10000.

NAT example

The following example illustrates how to configure static NAT mappings to run a Web
server and an FTP server on the internal network. This might occur when the CN3000 is
used in a enterprise environment.
NAT mapping used to support internal Web and FTP servers.
By creating static NAT mappings, FTP and HTTP (Web) traffic can be routed to the
proper client station. Note that the addresses of these stations are still not visible
externally. Remote computers send their requests to 202.125.11.26 and the CN3000
routes them to the proper client.
To configure the CN3000 to support this example, you would do the following:
1. On the main menu, click Network, then click NAT. The NAT mappings page
2. Click Add New Static NAT Mapping. The NAT mappings - Add static mapping page
3. Click Add to save your changes and return to the NAT mappings page. The new
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192.168.1.2
Web
server
192.168.1.1
FTP
server
192.168.1.3
appears. Initially it is empty.
appears.
• Under Requests for, choose Standard Services, then choose http (TCP 80).
• Under Translate to, specify the IP address of the Web server. In the example, it is
192.168.1.2.
mapping is added to the table.
NAT
202.125.11.26
Web
browser
FTP
client