BenQ ESG-103 - Manual (Page 5)

Chapter 1 Introduction - 1
Chapter 1 Introduction
1.1 Product Introduction
The ESG-103 is a broadband router, which is to provide home users a
secure environment in their private side. It also acts as a Network Address
Translation (NAT) device and let home users use private IP addresses to
access the Internet from single or multiple global IP addresses. ESG-103 pro-
vides home users an environment protected by its NAT-type firewall.
Because its WAN side is also an Ethernet interface, which is the same as its
LAN interface, you can easily plug it into any access device, such as an ADSL/
Cable modem or router, which provides Ethernet interfaces in the LAN side
to run for NAT function.
1.2 Key Features
1.2.1 Being a router between two Ethernet interfaces
The ESG-103 connects one Ethernet interface, which is from ADSL/Cable
modem's LAN side as its WAN interface. It provides users in its 10/100
base-TX LAN side which can share a single valid IP address. From this kind of
configuration, users do not need to apply for a valid IP address for everyone
in its LAN side to access Internet. This function can be enabled or disabled. If
users apply for many public IP addresses for some purpose, they are also
able to use those IP addresses to connect to the Internet.
FTP
Server
Telnet
Server
Host
LAN
ESG-103
WAN
ADSL/Cable
Modem
Internet
Application Illustration