Draytek VIGOR2925 SERIES User Manual page 265

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3. When you finish the configuration, please click OK to save and exit this page.
Packet Forwarding to WAN via – When you choose
WAN (e.g., WAN1) as the Interface for packet
transmission, you have to specify the way the packet
forwarded to. Choose Force NAT or Force Routing.
Failover to – Check this button to lead the data passing
through specific interface (WAN/LAN/VPN/Route Policy)
automatically when the selected interface (defined in Send
via if criteria matched) is down.

WAN/LAN – Use the drop down list to choose an
interface as an auto failover interface.

VPN – Use the drop down list to choose a VPN tunnel
as a failover tunnel.

Route Policy – Use the drop down list to choose an
existed route policy profile.
Gateway IP – Specific gateway is used only when you
want to forward the packets to the desired gateway.
Usually, Default Gateway is selected in default.
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Vigor2925 Series User's Guide