Draytek VIGOR2925 SERIES User Manual page 431

Detail Information
Detailed Settings for Advanced Backup
Available settings are explained as follows:
This field will display detailed information for Binding
Tunnel Policy. Below shows a successful binding tunnel
policy for load balance:
Note : To configure a successful binding tunnel, you
have to:
Type Binding Src IP range (Start and End) and Binding Des
IP range (Start and End). Choose TCP/UDP, IGMP/ICMP
or Other as Binding Protocol.
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Vigor2925 Series User's Guide