D-Link DFL-900 User Manual page 114

Part V
Virtual Private Network
Step 1. Enable IPSec ADVANCED SETTINGS > VPN Settings > Pass Through
If we need to setup DFL-1500 between the
existed IPSec / PPTP / L2TP connections. We
need to open up the Firewall blocking port of
DFL-1500 in advance. Here we provide a simple
way. You can through enable the IPSec / PPTP
/ L2TP pass through checkbox on this page.
Then the VPN connections of IPSec / PPTP /
L2TP will pass through DFL-1500. As well as
DFL-1500 will play the middle forwarding device
role.
For the IPSec/PPTP/L2TP description, please refer the later individual chapter discussion.
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