NAT is a mechanism that can convert your private IP addresses into single public IP address. In AWL700, we do offer dynamic NAT, static NAT, and NAPT functions. Dynamic NAT means that you can assign a range of private IP addresses to map to a range of public IP addresses in the WAN interface. When one public IP address is mapped to one host, this public IP address could not be assigned to the others. Static NAT means you can set up a private IP address and public IP address to be a pair. In AWL700, we offer five sets to do static NAT. This function is very similar to DMZ (demilitarized zone) one, so In AWL700, this also acts as “Virtual DMZ” host setting. NAPT is a special function of NAT, which will record packet’s Port and IP address and convert it to public IP address in the WAN side and give this session one unique port number. Most of the famous applications are supported by AWL700 such as HTTP, FTP, Telnet, NetMeeting, Real Player, QuickTime, …etc. NAT function is default as enabled in AWL700.

3.3.3.1 Table of current virtual server entries

Sometimes there are servers located in the LAN interface and wish to be accessed by any remote host. However, we could not access these servers located in the LAN interface directly because of the enabling of NAT. We could use Virtual Server to let remote hosts access internal servers. In this configuration page, you can enter a public port that is bound on a server located in the LAN interface. For example, FTP server’s public port is 21, Telnet server’s public port is 23, and HTTP server’s public port is 80. After that, you should offer a host that maps to this public port. In configuration figure below, you can map port 21 to that host which IP address is 192.168.123.101 and the remote host can access FTP server in the LAN interface by accessing 211.21.85.141 through FTP client application installed in the remote host itself. When you access AWL700’s WAN side, it can convert your FTP packets and let them pass through the NAT.

192.168.123.101

H ost

FTP S erver

192.168.123.100

 

Ethernet

211.21.85.141

 

Internet

Telnet S erver

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