D-Link AC3200 Ultra User Manual page 188

Section 6 - Quick VPN
VPN Setup Instructions (Continued)
Click Advanced settings. Enter your Passkey in the Key text box under Use
preshared key for authentication.
Click OK to close Advanced Properties and click OK to close Quick VPN
Properties.
Your Windows 8.1/8 system is now configured to connect to your Quick VPN server.
D-Link DIR-890L User Manual 183