D-Link NetDefendOS User Manual page 751

1. Go to: Network > Interfaces and VPN > Ethernet
2. Select the If1 interface
3. Select the option Enable transparent mode
4. Click OK
Setup With VLANs
The NetDefendOS L2TPv3 client can handle VLAN tagged Ethernet frames so that a protected
internal network can be access an external network over VLAN connections. The setup of the
VLANs is done in the same way as for the server and this is fully described in Section 9.6.1, "L2TPv3
Server".
When setting up the L2TPv3 client object, the PseudowireType property must be set to the value
VLAN.
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Chapter 9: VPN