ZyXEL Communications ISG50 User Manual

 Chapter 6 Configuration Basics

ISG50 User’s Guide

• Virtual interfaces increase the amount of routing information in the ISG50. There are three 

types: virtual Ethernet interfaces (also known as IP alias), virtual VLAN interfaces, and 
virtual bridge interfaces.

This section introduces the ISG50’s default zone member physical interfaces and the default 
configuration of those interfaces. The following figure uses letters to denote public IP addresses or 
part of a private IP address.

Default Network Topology        

ISG50 Default Port, Interface, and Zone Configuration 

• The WAN zone contains the wan1 and wan2 interfaces (physical ports P1 and P2). They use 

public IP addresses to connect to the Internet.

• The LAN1 zone contains the lan1 interface (physical port P3). The LAN1 zone is a protected 

zone. The lan1 interface uses 192.168.1.1 and the connected devices use IP addresses in the 
192.168.1.2 to 192.168.1.254 range.

• The LAN2 zone contains the lan2 interface (physical port P4). The LAN2 zone is a protected 

zone. The lan2 interface uses 192.168.2.1 and the connected devices use IP addresses in the 
192.168.2.2 to 192.168.2.254 range.

• The DMZ zone contains the dmz interface (physical port P5). The DMZ zone has servers that are 

available to the public. The dmz interface uses private IP address 192.168.3.1 and the connected 
devices use private IP addresses in the 192.168.3.2 to 192.168.3.254 range.

P1, P2

wan1, wan2

WAN 

DHCP clients

Connections to the Internet

P3

lan1

LAN1

192.168.1.1, DHCP server enabled

Protected LAN

P4

lan2

LAN2

192.168.2.1, DHCP server enabled

Protected LAN

P5

dmz

DMZ

192.168.3.1, DHCP server disabled

Public servers (such as web, e-
mail and FTP)

CONSOLE

n/a

None

None

Local management