EKI-6333AC-2GD Series User Manual
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3.5.2
NAT
Network Address Translation (NAT) allows the device to provide an agent function
between the public network (Internet) and the private network (local). This allows a
single unique IP address to represent a group of connected devices access to the
external network.
By the same token, when a packet enters the domain, NAT translates the external
(public) unique address into a private local address.
Figure 3.43 NAT Diagram
3.5.3
Forwarding
3.5.3.1
Port Forwarding
Port forwarding, also known as port mapping, allows for the application of network
addresses (NAT) the redirection of a communication request from an address and
port to a specified address while the packets traverse the firewall.
The function are designed for networks hosting a specific server, such as a web
server or mail server, on the private local network and behind the NAT firewall.
Figure 3.44 Port Forwarding
Host A
192.168.1.100/24
Server
Router
Host B
192.168.1.101/24
Host C
192.168.1.102/24
Host C
Host B
192.168.1.102/24
Internet
EKI-6333AC-2GD
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NB/PC
http Server
192.168.1.10
Port 80
214.12.22.30:80~82
Port 21
214.12.22.30:21
Port 22
214.12.22.30:22
FTP Server
192.168.1.20
SSH Server
192.168.1.30
Internet
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S
Server
2.168.1.10
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Server
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192
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