ZyXEL Communications ZyWALL USG Series Application Notes page 172

avoid an IP address conflict, do not connect USG B to the LAN subnet until after you configure its
device HA settings and the instructions tell you to deploy it.
4.4.3 Configure Device HA on the Master USG
Log into USG A (the master) and click Configuration > Device HA > Active-Passive Mode.
1
Double-click the LAN interface's entry.
Configure 192.168.1.3 as the Manage IP and 255.255.255.0 as the Manage IP Subnet Mask.
2
Click OK.
3 Set the Device Role to Master. This example focuses on the connection from the LAN to the Internet
through the WAN interface, so select the LAN and WAN interfaces and click Activate. Enter a
Synchronization Password ("mySyncPassword" in this example). Retype the password and click
Apply.
Click the General tab, enable device HA, and click Apply.
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