Since PPTP VPN is no longer supported by Apple’s built-in
VPN client on macOS Sierra and iOS 10, Draytek recommends that SSL VPN be used
instead.
The SmartVPN client is available in the App Store now.
- iOS
https://itunes.apple.com/app/smart-vpn/id1071356755?mt=8 - macOS
https://itunes.apple.com/app/smart-vpn/id1086913769?mt=12
Please refer to these FAQs for more details.
Mac Smart VPN to Vigor Router - SSL VPN
SmartVPN iOS app to Vigor Router - SSL VPN
If the user prefers to use Apple's native VPN client, L2TP over IPsec should
be selected to ensure interoperability with Vigor routers.
Here are additional Draytek FAQs for your reference.