Planet CS-2000 User Manual page 512

Step4 Set the backup device settings in high availability mode.
Interface
High Availability
In Permitted IPs, enter the IP 192.168.10.200, which is differing from master device but in
the same segment as LAN.
High Availability
Complete the backup device setting.
To connect the LAN Switch to master device.
Complete the high availability deployment. The master and backup device's LAN, WAN
and DMZ port need to be connected to the same switch.
The backup device setting Web UI in high availability mode
CS-2000 UTM Content Security Gateway User's Manual
LAN, to make sure the LAN IP is the same as master LAN IP. (192.168.10.1）
Enable High Availability.
High Availability Mode, select BACKUP.
LAN interface setting
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