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Chapter 5 Managing Traffic
ZyWALL USG 20-2000 User’s Guide
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5.4.5 Deploy the Backup ZyWALL
Connect ZyWALL Bs LAN interface to the LAN network. Connect ZyWALL B’s WAN interface to the
same router that ZyWALL A’s WAN interface uses for Internet access. ZyWALL B copies A’s
configuration (and re-synchronizes with A every hour). If ZyWALL A fails or loses its LAN or WAN
connection, ZyWALL B functions as the master.
5.4.6 Check Your Device HA Setup
1 To make sure ZyWALL B copied ZyWALL A’s settings, you can log into ZyWALL Bs management IP
address (192.168.1.5) and check the configuration. You can use the Maintenance > File
Manager > Configuration File screen to save copies of the ZyWALLs’ configuration files that you
can compare.
2 To test your device HA configuration, disconnect ZyWALL A’s LAN or WAN interface. Computers on
LAN should still be able to access the Internet. If they cannot, check your connections and device
HA configuration.
Congratulations! Now that you have configured device HA for LAN, you can use the same process
for any of the ZyWALL’s other local networks. For example, enable device HA monitoring on the
DMZ interfaces and use an Ethernet switch to connect both ZyWALLs’ DMZ interfaces to your
publicly available servers.
5.5 How to Configure DNS Inbound Load Balancing
This example shows you how to configure the ZyWALL to respond to DNS query messages with the
least loaded interface’s IP address. The DNS query senders will then transmit packets to that
interface instead of an interface that has a heavy load.
This example assumes that your company’s domain name is www.example.com. You want your
ZyWALL’s WAN1 (202.1.2.3) and WAN2 (202.5.6.7) to use DNS inbound load balancing to balance
traffic loading coming from the Internet.
1 In the CONFIGURATION > Network > Inbound LB screen, select Enable DNS Load
Balancing. Click Apply.
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