14. Use the Backup Server page to optionally specify up to three IPsec VPN servers as backup. When the connection to the primary server fails, remote VPN clients can attempt to connect to the backup servers.
Backup Server 1/2/3: Enter the IP address or domain name for the backup server. The backup server 1 has the highest priority and the backup server 3 has the lowest priority.
NOTE: The backup servers that you specified on the IPsec VPN server will be sent to remote VPN clients when initiating the VPN connections. The remote VPN clients will cache them.