ZyXEL Communications ZyWALL Troubleshooting Manual page 8

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Configuration  Firewall OR Configuration  Security
Policy  Policy Control
 Make sure the L2TP connection has a higher priority than any
other route on your computer. On macOS you need to change
the service order to give the VPN connection a higher priority
than the Ethernet or Wi-Fi connections.
Windows: All routes for the L2TP interface should have a higher
metric than the standard routes. Open command prompt or
PowerShell and type route print to view the routing table.
macOS: Open System Preferences  Network, click the
configuration icon at the bottom of the network
interface list and "Set Service Order".
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