ZyXEL Communications 70 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

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Chapter 7 WAN Screens

1 The ISP tells you the DNS server addresses, usually in the form of an information sheet, 

when you sign up. If your ISP gives you DNS server addresses, manually enter them in 
the DNS server fields.

2 If your ISP dynamically assigns the DNS server IP addresses (along with the ZyWALL’s 

WAN IP address), set the DNS server fields to get the DNS server address from the ISP. 

3 You can manually enter the IP addresses of other DNS servers. These servers can be 

public or private. A DNS server could even be behind a remote IPSec router (see 

Every Ethernet device has a unique MAC (Media Access Control) address. The MAC address 
is assigned at the factory and consists of six pairs of hexadecimal characters, for example, 
00:A0:C5:00:00:02.

You can configure the WAN port's MAC address by either using the factory default or cloning 
the MAC address from a computer on your LAN. Once it is successfully configured, the 
address will be copied to the "rom" file (ZyNOS configuration file). It will not change unless 
you change the setting or upload a different "rom" file. 

To change your ZyWALL's WAN ISP, IP and MAC settings, click NETWORK, WAN and 
then the WAN, WAN1 or WAN2 tab. The screen differs by the encapsulation.

Note: The WAN1 and WAN2 IP addresses of a ZyWALL with multiple WAN ports 

must be on different subnets. 

For ISPs (such as Telstra) that send UDP heartbeat packets to verify that the customer is still 
online, please create a WAN-to-WAN/ZyWALL firewall rule for those packets. Contact your 
ISP to find the correct port number.

The screen shown next is for Ethernet encapsulation. 

Table 38   Example of Network Properties for LAN Servers with Fixed IP Addresses

Choose an IP address

192.168.1.2-192.168.1.32; 192.168.1.65-192.168.1.254.

Subnet mask 

255.255.255.0

Gateway (or default route)

192.168.1.1(ZyWALL LAN IP)