Draytek Vigor2912 User Manual page 181

4. After specifying the interface, click Next to get the following page.
Available settings are explained as follows:
Item
Force NAT /Force
Routing
5. After choosing the mechanism, click Next to get the summary page for reference.
6. If there is no error, click Finish to complete wizard setting.
Description
It determines which mechanism that the router will use to
forward the packet to WAN.
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Vigor2912 Series User's Guide