ZyXEL Communications 100 Series User Manual

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 Chapter 2 Features and Applications
ZyWALL USG 100/200 Series User’s Guide
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Figure 8   Applications: Multiple WAN Interfaces
2.3.5  Device HA
Set up an additional ZyWALL as a backup gateway to ensure the default gateway is always 
available for the network.
Figure 9   Applications: Device HA