PLANET CS-2001 - Manual (Page 761)

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Figure 25-6 Backup Device Taking Over Operations When Master Device Fails
6. Note:
 During backup, if the WAN port is using a dynamic IP address and it is in the process of
being renewed, the session will disconnect.
 IPSec VPN Connections: the IT administrator needs to set the Keepalive IP Address
under Policy Object > VPN > Trunk so that a VPN session can be re-established without
delay druing backup.
 PPTP VPN Connections: during backup, the connection will disconnect and the remote
user will need to re-establish the connection.