Deploy The Backup Zywall - ZyXEL Communications ZYWALL USG 1000 - EDITION 2 Manual

Chapter 7 Tutorials
Set the Device Role to Backup. Activate monitoring for the ge1 and ge2
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interfaces. Set the Synchronization Server Address to 192.168.1.1, the Port
to 21, and the Password to "mySyncPassword". Select Auto Synchronize and
set the Interval to 60. Click Apply.
Figure 126 Configuration > Device HA > Active-Passive Mode: Backup ZyWALL
Example
Click the General tab. Turn on device HA and click Apply.
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Figure 127 Configuration > Device HA > General: Master ZyWALL Example

7.14.4 Deploy the Backup ZyWALL

Connect ZyWALL B's ge1 interface to the LAN network. Connect ZyWALL B's ge2
interface to the same router that ZyWALL A's ge2 interface uses for Internet
access. ZyWALL B copies A's configuration (and re-synchronizes with A every
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ZyWALL USG 1000 User's Guide