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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.
Ethernet
FTP Server
Telnet Server
PWR
OK
WIC0
ACT/CH0
ACT/C H 1
WIC0
ACT/CH0
ACT/CH1
ETH
ACT
COL
Internet
Host
192.168.123.101
211.21.85.141
192.168.123.100